It might seem ridiculous to consider buying a Blu-Ray here in The discs are expensive, take up space and can be damaged. Add to that, you can stream just about any movie or show that you want so long as you subscribe to a streaming service like Netflix or Hulu, or you’re willing to rent or buy it on-demand from your cable provider. You might be surprised then that a recent report conducted by the NPD Group showed that a lot of people are actually still buying Blu-ray discs and Blu-Ray players. You might be tempted to think they’re all dinosaurs, but you know what? They’re actually onto something.
The quality of Blu-Ray is guaranteed. Streaming quality is not.
A Blu-Ray’s quality isn’t necessarily better than what you can stream these days. Most streaming services offer shows and movies in 4K resolution, and the newest streamers (like the Apple TV 4K and Xbox One X) are also able to play 4K content as well, which is the same as what you’ll get out of an Ultra HD Blu-ray (and which is better than an older HD Blu-ray). The difference is that a 4K stream requires a connection that is not only fast in general, but fast when you want to watch your movie. If your home’s internet speed and bandwidth aren’t up to snuff — or there is a lot of congestion in your region when you are looking to stream — your video might not be in its highest resolution or it might hit you with a bunch of pauses and load screens while you’re watching. A Blu-ray disc obviously doesn’t rely on the internet, so its quality is always perfect even if the internet is completely down.
A Blu-Ray is forever, and it comes with a digital copy too.
One of streaming’s biggest advantages is that it allows you to watch a movie or show pretty much anywhere you want and on any device. With physical media like a Blu-Ray or a DVD, you’re much more limited, needing both the disc and a media player to play it. A few years ago a bunch of Hollywood studios launched Movies Anywhere, a free movie streaming service (similar to Netflix) that lets you enter a redeem code that comes with a purchased Blu-rays and DVDs, and then you can watch that digital copy whenever you want.
Movies Anywhere also acts as a resting place for the movies and shows you’ve purchased from other streaming services, like iTunes, Amazon Video and Google Play, and aggregate them with the digital copies of your Blu-Rays or DVDs so that everything is in one place. Movies Anywhere is a free app that you can download on your iOS or Android devices; it’s also available on most smart TV platforms including Android TV, Chromecast, Roku, and Amazon Fire TV.
But best of all, if you have a physical Blu-Ray, you never have to worry about your favorite movies “leaving” the streaming service where you watch them. No matter what happens to the digital rights of your favorite film now or years in the future, you will be able to put your disc in a player and go. It’s a degree of security that the modern streaming world, for all its up-to-the-second convenience, just cannot match.
The analog experience is still king.
For the same reasons that people are still buying vinyl, CDs and cassette tapes, they’re also buying Blu-rays and DVDs — it’s the nostalgic analog experience. There’s nothing quite like taking a disc out of its case, placing it your media player and hearing (and watching) the technology work. It’s visceral. There’s also the fact that you feel more of an attachment to things that are tangible. When you’re able to hold a physical copy of something, whether that be a Blu-ray or a book, that ownership helps you form a sort of bond with the material that a digital copy can’t replicate. Whether that’s actually important to you personally may come down to a matter of taste, but you can’t argue that there are plenty of people who appreciate the appeal.
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Optical disc format used for storing digital video and other digital data
The Blu-ray Disc (BD), often known simply as Blu-ray, is a digitaloptical discstorage format. It is designed to supersede the DVD format, and capable of storing several hours of high-definition video (HDTV p and p). The main application of Blu-ray is as a medium for video material such as feature films and for the physical distribution of video games for the PlayStation 3, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series X. The name "Blu-ray" refers to the blue laser (which is actually a violet laser) used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs.
The plastic disc is millimetres (in) in diameter and millimetres (in) thick, the same size as DVDs and CDs. Conventional or pre-BD-XL Blu-ray Discs contain 25GB per layer, with dual-layer discs (50GB) being the industry standard for feature-length video discs. Triple-layer discs (GB) and quadruple-layer discs ( GB) are available for BD-XL re-writer drives.
High-definition (HD) video may be stored on Blu-ray Discs with up to × pixel resolution, at 24 progressive or 50/60 interlaced frames per second. DVD-Video discs were limited to a maximum resolution of i (NTSC, × pixels) or i (PAL, × pixels). Besides these hardware specifications, Blu-ray is associated with a set of multimedia formats.
The BD format was developed by the Blu-ray Disc Association, a group representing makers of consumer electronics, computer hardware, and motion pictures. Sony unveiled the first Blu-ray Disc prototypes in October , and the first prototype player was released in Japan in April Afterward, it continued to be developed until its official worldwide release on June 20, , beginning the high-definition optical disc format war, where Blu-ray Disc competed with the HD DVD format. Toshiba, the main company supporting HD DVD, conceded in February , and later released its own Blu-ray Disc player in late  According to Media Research, high-definition software sales in the United States were slower in the first two years than DVD software sales. Blu-ray faces competition from video on demand (VOD) and the continued sale of DVDs. In January , 44% of U.S. broadband households had a Blu-ray player. For playback of 4K content, the BDA introduced a variant of Blu-ray called Ultra HD Blu-ray.
The information density of the DVD format was limited by the wavelength of the laser diodes used. Following protracted development, blue laser diodes operating at nanometers became available on a production basis, allowing for development of a more-dense storage format that could hold higher-definition media, with prototype discs made with diodes at a slightly longer wavelength of nanometers in October Sony started two projects in collaboration with Panasonic, Philips, and TDK, applying the new diodes: UDO (Ultra Density Optical), and DVR Blue (together with Pioneer), a format of rewritable discs that would eventually become Blu-ray Disc (more specifically, BD-RE). The core technologies of the formats are similar. The first DVR Blue prototypes were unveiled by Sony at the CEATEC exhibition in October  A trademark for the "Blue Disc" logo was filed on February 9,  On February 19, , the project was officially announced as Blu-ray Disc, and Blu-ray Disc Founders was founded by the nine initial members.
The first consumer device arrived in stores on April 10, the Sony BDZ-S77, a US$3, BD-RE recorder that was made available only in Japan. However, there was no standard for prerecorded video, and no movies were released for this player. Hollywood studios insisted that players be equipped with digital rights management before they would release movies for the new format, and they wanted a new DRM system that would be more secure than the failed Content Scramble System (CSS) used on DVDs. On October 4, , the name "Blu-ray Disc Founders" was officially changed to the Blu-ray Disc Association (BDA), and 20th Century Fox joined the BDA's Board of Directors. The Blu-ray Disc physical specifications were completed in 
In January , TDK announced that it had developed an ultra-hard yet very thin polymer coating ("Durabis") for Blu-ray Discs; this was a significant technical advance because a far tougher protection was desired in the consumer market to protect bare discs against scratching and damage compared to DVD, while technically Blu-ray Disc required a much thinner layer for the denser and higher-frequency blue laser. Cartridges, originally used for scratch protection, were no longer necessary and were scrapped. The BD-ROM specifications were finalized in early 
Advanced Access Content System Licensing Administrator (AACS LA), a consortium founded in , had been developing the DRM platform that could be used to securely distribute movies to consumers. However, the final AACS standard was delayed, and then delayed again when an important member of the Blu-ray Disc group voiced concerns. At the request of the initial hardware manufacturers, including Toshiba, Pioneer, and Samsung, an interim standard was published that did not include some features, such as managed copy.
Launch and sales developments
The first BD-ROM players (Samsung BD-P) were shipped in mid-June , though HD DVD players beat them to market by a few months. The first Blu-ray Disc titles were released on June 20, 50 First Dates, The Fifth Element, Hitch, House of Flying Daggers, Underworld: Evolution, xXx (all from Sony), and MGM's The Terminator. The earliest releases used MPEG-2 video compression, the same method used on standard DVDs. The first releases using the newer VC-1 and AVC formats were introduced in September  The first movies using 50GB dual-layer discs were introduced in October  The first audio-only albums were released in May 
By June , over 2, Blu-ray Disc titles were available in Australia and the United Kingdom, with 3, in the United States and Canada. In Japan, over 3, titles have been released as of July 
Competition from HD DVD
Main article: High-definition optical disc format war
The DVD Forum, chaired by Toshiba, was split over whether to develop the more expensive blue laser technology. In March the forum approved a proposal, which was endorsed by Warner Bros. and other motion picture studios. The proposal involved compressing high-definition video onto dual-layer standard DVD-9 discs. In spite of this decision, however, the DVD Forum's Steering Committee announced in April that it was pursuing its own blue-laser high-definition video solution. In August, Toshiba and NEC announced their competing standard, the Advanced Optical Disc. It was finally adopted by the DVD Forum and renamed HD DVD the next year, after being voted down twice by DVD Forum members who were also Blu-ray Disc Association members—a situation that drew preliminary investigations by the U.S. Department of Justice.
HD DVD had a head start in the high-definition video market, as Blu-ray Disc sales were slow to gain market share. The first Blu-ray Disc player was perceived as expensive and buggy, and there were few titles available.
The Sony PlayStation 3, which contained a Blu-ray Disc player for primary storage, helped support Blu-ray. Sony also ran a more thorough and influential marketing campaign for the format.AVCHD camcorders were also introduced in These recordings can be played back on many Blu-ray Disc players without re-encoding but are not compatible with HD DVD players. By January , Blu-ray Discs had outsold HD DVDs, and during the first three quarters of , BD outsold HD DVD by about two to one. At CES , Warner proposed Total Hi Def—a hybrid disc containing Blu-ray on one side and HD DVD on the other, but it was never released.
On June 28, , 20th Century Fox cited Blu-ray Disc's adoption of the BD+ anticopying system as key to their decision to support the Blu-ray Disc format. On January 4, , a day before CES , Warner Bros. (the only major studio still releasing movies in both HD DVD and Blu-ray Disc format) announced that it would release only in Blu-ray Disc after May  This effectively included other studios that came under the Warner umbrella, such as New Line Cinema and HBO—though in Europe, HBO's distribution partner, the BBC, announced it would, continue to release product on both formats while keeping an eye on market forces. This led to a chain reaction in the industry, with major American retailers such as Best Buy, Walmart, and Circuit City and Canadian chains such as Future Shop dropping HD DVD in their stores. Woolworths, then a major European retailer, dropped HD DVD from its inventory. Major DVD rental companies Netflix and Blockbuster said they would no longer carry HD DVD.
Following these new developments, on February 19, , Toshiba announced it would end production of HD DVD devices, allowing Blu-ray Disc to become the industry standard for high-density optical discs. Universal Studios, the sole major studio to back HD DVD since its inception, said shortly after Toshiba's announcement: "While Universal values the close partnership we have shared with Toshiba, it is time to turn our focus to releasing new and catalog titles on Blu-ray Disc."Paramount Pictures, which started releasing movies only in HD DVD format during late , also said it would start releasing on Blu-ray Disc. Both studios announced initial Blu-ray lineups in May With this, all major Hollywood studios supported Blu-ray.
Future scope and market trends
This article needs to be updated. Please help update this article to reflect recent events or newly available information.(April )
According to Media Research, high-definition software sales in the United States were slower in the first two years than DVD software sales. million DVD software units were sold in the first two years (–) compared to million high-definition software units (–). One reason given for this difference was the smaller marketplace ( million HDTVs in compared to million SDTVs in ). Former HD DVD supporter Microsoft did not make a Blu-ray Disc drive for the Xbox  The 's successor Xbox One features a Blu-ray drive, as does the PS4, with both supporting 3D Blu-ray after later firmware updates.
Shortly after the "format war" ended, Blu-ray Disc sales began to increase. A study by the NPD Group found that awareness of Blu-ray Disc had reached 60% of households in the United States. Nielsen VideoScan sales numbers showed that for some titles, such as 20th Century Fox's Hitman, up to 14% of total disc sales were from Blu-ray, although the average Blu-ray sales for the first half of the year were only around 5%. In December , the Blu-ray Disc version of Warner Bros.' The Dark Knight sold , copies on the first day of its launch in the United States, Canada, and the United Kingdom. A week after the launch, The Dark Knight BD had sold over million copies worldwide, making it the first Blu-ray Disc title to sell over a million copies in the first week of release.
According to Singulus Technologies AG, Blu-ray was adopted faster than the DVD format was at a similar period in its development. This conclusion was based on the fact that Singulus Technologies received orders for 21 Blu-ray dual-layer replication machines during the first quarter of , while 17 DVD replication machines of this type were made in the same period in  According to GfK Retail and Technology, in the first week of November , sales of Blu-ray recorders surpassed DVD recorders in Japan. According to the Digital Entertainment Group, the number of Blu-ray Disc playback devices (both set-top box and game console) sold in the United States had reached million by the end of 
Blu-ray faces competition from video on demand and from new technologies that allow access to movies on any format or device, such as Digital Entertainment Content Ecosystem or Disney's Keychest. Some commentators suggested that renting Blu-ray would play a vital part in keeping the technology affordable while allowing it to move forward. In an effort to increase sales, studios began releasing films in combo packs with Blu-ray Discs and DVDs, as well as digital copies that can be played on computers and mobile devices. Some are released on "flipper" discs with Blu-ray on one side and DVD on the other. Other strategies are to release movies with the special features only on Blu-ray Discs and none on DVDs.
Blu-ray discs cost no more to produce than DVD discs. However, reading and writing mechanisms are more complicated, making Blu-ray recorders, drives and players more expensive than their DVD counterparts. Adoption is also limited due to the widespread use of streaming media. Blu-ray discs are used to distribute PlayStation 3, PlayStation 4, PlayStation 5, Xbox One and Xbox Series X games, and the aforementioned game consoles can play back regular Blu-ray discs.
Ultra HD Blu-ray discs and players became available in the first quarter of , having a storage capacity of up to GB.
The Holographic Versatile Disc (HVD), described in the ECMA standard, has been in development by the Holography System Development (HSD) Forum using a green writing/reading laser (nm) and a red positioning/addressing laser (nm). It is to offer MPEG-2, MPEG-4 AVC (H), HEVC (H), and VC-1 encoding, supporting a maximum storage capacity of 6TB. No systems conforming to the Ecma International HVD standard have been released. Because the Blu-ray Disc format is upgradable it poses challenges to the adoption of the HVD format.
This article needs to be updated. Please help update this article to reflect recent events or newly available information.(April )
Although the Blu-ray Disc specification has been finalized, engineers continue to work on advancing the technology. By , quad-layer (GB) discs had been demonstrated on a drive with modified optics and standard unaltered optics. Hitachi stated that such a disc could be used to store 7hours of 32Mbit/s video (HDTV) or 3hours and 30minutes of 64Mbit/s video (ultra-high-definition television). In April , TDK canceled plans to produce 8-layer GB Blu-ray Discs. In August , TDK announced that it had created a working experimental Blu-ray Disc capable of holding GB of data on a single side, using six 33GB data layers. In , Hitachi was reported to have plans to produce GB disks by 
Behind closed doors at CES , Ritek revealed that it had successfully developed a high-definition optical disc process that extended the disc capacity to ten layers, increasing the capacity of the discs to GB. However, it noted the major obstacle was that current read/write technology did not allow additional layers.JVC developed a three-layer technology that allows putting both standard-definition DVD data and HD data on a BD/(standard) DVD combination. This would have enabled the consumer to purchase a disc that can be played on DVD players and can also reveal its HD version when played on a BD player. Japanese optical disc manufacturer Infinity announced the first "hybrid" Blu-ray Disc/(standard) DVD combo, to be released February 18, This disc set of the TV series "Code Blue" featured four hybrid discs containing a single Blu-ray Disc layer (25GB) and two DVD layers (9GB) on the same side of the disc.
In January , Hitachi showcased a GB Blu-ray Disc, consisting of four layers containing 25GB each. It claimed that, unlike TDK's and Panasonic's GB discs, this disc would be readable on standard Blu-ray Disc drives that were currently in circulation, and it was believed that a firmware update was the only requirement to make it readable by then-current players and drives. In October they revealed a GB Blu-ray disc drive. In December , Pioneer Corporation unveiled a GB Blu-ray Disc (containing 16 data layers, 25GB each) compatible with current players after a firmware update. Its planned launch was in the –10 time frame for ROM and –13 for rewritable discs. Ongoing development was underway to create a 1TB Blu-ray Disc.
At CES , Panasonic unveiled the DMP-B15, the first portable Blu-ray Disc player, and Sharp introduced the LC-BD60U and LC-BD80U series, the first LCD HDTVs with integrated Blu-ray Disc players. Sharp also announced that it would sell HDTVs with integrated Blu-ray Disc recorders in the United States by the end of Set-top box recorders were not being sold in the U.S. for fear of unauthorized copying. However, personal computers with Blu-ray recorder drives were available. In October , TDK demonstrated a layer GB Blu-ray disc. On January 1, , Sony, in association with Panasonic, announced plans to increase the storage capacity on their Blu-ray Discs from 25GB to GB via a technology called i-MLSE (Maximum likelihood Sequence Estimation). The higher-capacity discs, according to Sony, would be readable on existing Blu-ray Disc players with a firmware upgrade. This technology was later used on BDXL discs.
On July 20, , the research team of Sony and Japanese Tohoku University announced the joint development of a blue-violet laser, to help create Blu-ray Discs with a capacity of 1 TB using only two layers (and potentially more than 1 TB with additional layering). By comparison, the first blue laser was invented in , with the first prototype discs coming four years later.
On January 7, , Sony announced that it would release "Mastered in 4K" Blu-ray Disc titles sourced at 4K and encoded at p. "Mastered in 4K" Blu-ray Disc titles can be played on existing Blu-ray Disc players and have a larger color space using xvYCC. On January 14, , Blu-ray Disc Association president Andy Parsons stated that a task force was created three months prior to conduct a study concerning an extension to the Blu-ray Disc specification that would add the ability to contain 4K Ultra HD video.
On August 5, , the Blu-ray Disc Association (BDA) announced it would commence licensing the Ultra HD Blu-ray format starting on August 24, The Ultra HD Blu-ray format delivered high dynamic range content that significantly expanded the range between the brightest and darkest elements, expanded color range, high frame rate (up to 60fps) and up to × resolution, object-based sound formats, and an optional "digital bridge" feature. New players were required to play this format, which were able to play both DVDs, traditional Blu-rays and the new format. New Ultra HD Blu-ray Discs hold up to 66GB and GB of data on dual- and triple-layer discs, respectively.
Blu-ray's physical and file system specifications are publicly available on the Blu-ray disc association's website.
* Some CD-R(W) and DVD-R(W)/DVD+R(W) recorders operate in ZCLV, CAA or CAV modes.
|Standard disc size, single layer||12||1||25,,,|
|Standard disc size, dual layer||12||2||50,,,|
|Standard disc size, XL 3 layer||12||3||,,,|
|Standard disc size, XL 4 layer||12||4||,,,|
|Mini disc size, single layer||8||1||7,,,|
|Mini disc size, dual layer||8||2||15,,,|
Laser and optics
While a DVD uses a nm red laser, Blu-ray Disc uses a nm "blue" laser diode. Although the laser is called "blue", its color is actually in the violet range. The shorter wavelength can be focused to a smaller area, thus enabling it to read information recorded in pits that are less than half the size of those on a DVD, and can consequently be spaced more closely, resulting in a shorter track pitch, enabling a Blu-ray Disc to hold about five times the amount of information that can be stored on a DVD. The lasers are GaN (gallium nitride) laser diodes that produce nm light directly, that is, without frequency doubling or other nonlinear optical mechanisms.CDs use nm near-infrared lasers.
The minimum "spot size" on which a laser can be focused is limited by diffraction and depends on the wavelength of the light and the numerical aperture of the lens used to focus it. By decreasing the wavelength, increasing the numerical aperture from to , and making the cover layer thinner to avoid unwanted optical effects, designers can cause the laser beam to focus on a smaller spot, which effectively allows more information to be stored in the same area. For a Blu-ray Disc, the spot size is nm. This allows a reduction of the pit size from nm for DVD to nm for Blu-ray Disc, and of the track pitch from nm to nm. See compact disc for information on optical discs' physical structure. In addition to the optical improvements, Blu-ray Discs feature improvements in data encoding that further increase the amount of content that can be stored.
Given that the Blu-ray Disc data layer is closer to the surface of the disc compared to the DVD standard, it was found in early designs to be more vulnerable to scratches. The first discs were therefore housed in cartridges for protection, resembling Professional Discs introduced by Sony in Using a cartridge would increase the price of an already expensive medium, and would increase the size of Blu-ray disc drives, so designers chose hard-coating of the pickup surface instead. TDK was the first company to develop a working scratch-protection coating for Blu-ray Discs, naming it Durabis. In addition, both Sony's and Panasonic's replication methods include proprietary hard-coat technologies. Sony's rewritable media are spin-coated, using a scratch-resistant acrylic and antistatic coating.Verbatim's recordable and rewritable Blu-ray Discs use their own proprietary technology, called Hard Coat. Colloidal silica-dispersed UV-curable resins are used for the hard coating, given that, according to the Blu-ray Disc Association, they offer the best tradeoff between scratch resistance, optical properties, and productivity. 
The Blu-ray Disc specification requires the testing of resistance to scratches by mechanical abrasion. In contrast, DVD media are not required to be scratch-resistant, but since development of the technology, some companies, such as Verbatim, implemented hard-coating for more expensive lines of recordable DVDs.
|Drive speed||Data rate||~Write time (minutes)||~CAV Rotation speed (RPM)|
The table shows the speeds available. Even the lowest speed (1×) is sufficient to play and record real-time p video; the higher speeds are relevant for general data storage and more sophisticated handling of video. BD discs are designed to cope with at least 5,rpm of rotational speed.
The usable data rate of a Blu-ray Disc drive can be limited by the capacity of the drive's data interface. With a USB interface, the maximum exploitable drive speed is Mbit/s or 36MB/s (also called 8× speed). A USB interface (with proper cabling) does not have this limitation, nor do even the oldest version of Serial ATA (SATA, MB/s) nor the latest Parallel ATA ( MB/s) standards. Internal Blu-ray drives that are integrated into a computer (as opposed to physically separate and connected via a cable) typically have a SATA interface.
More recent half-height Blu-Ray writers have reached writing speeds of up to 16× (constant angular velocity) on single-layer BD-R media, while the highest reading speeds are 12×, presumably to prevent repeated physical stress on the disc. Slim type drives are limited to 6× speeds (constant angular velocity) due to spacial and power limitations.
Media quality and data integrity
Main article: Optical disc §Surface error scanning
The quality and data integrity of optical media can be determined by measuring the rate of errors, of which higher rates may be an indication for deteriorating media, low-quality media, physical damage such as scratches, dust, and/or media written using a defective optical drive.
Errors on Blu-Ray media is measured using the so-called LDC (Long Distance Codes) and BIS (Burst Indication Subcodes) error parameters, of which rates below 13 and 15 respectively can be considered healthy.
Not all vendors and models of optical drives have error scanning functionality implemented.
Pre-recorded Blu-ray Disc titles usually ship in packages similar to but slightly smaller (mm shorter and 2mm thinner: mm × mm × 13mm), as well as more rounded than a standard DVDkeep case, generally with the format prominently displayed in a horizontal stripe across the top of the case (translucent blue for Blu-ray video discs, clear for Blu-ray 3D video releases, red for PlayStation 3 Greatest Hits Games, transparent for regular PlayStation 3 games, transparent dark blue for PlayStation 4 and PlayStation 5 games, transparent green for Xbox One and Xbox Series X games and black for Ultra HD Blu-ray video releases). Warren Osborn and The Seastone Media Group, LLC created the package that was adopted worldwide following the Blu-ray versus HD DVD market adoption choice. Because Blu-ray cases are smaller than DVD cases, more Blu-rays than DVDs can fit on a shelf.
Mini Blu-ray Disc
The "Mini Blu-ray Disc" (also, "Mini-BD" and "Mini Blu-ray") is a compact 8-centimetre-diameter (in) variant of the Blu-ray Disc that can store GB of data in its single-layer configuration, or GB on a dual-layer disc. It is similar in concept to the MiniDVD and MiniCD. Recordable (BD-R) and rewritable (BD-RE) versions of Mini Blu-ray Disc have been developed specifically for compact camcorders and other compact recording devices.
Blu-ray Disc recordable
Main article: Blu-ray Disc recordable
"Blu-ray Disc recordable" (BD-R) refers to two optical disc formats that can be recorded with an optical disc recorder. BD-Rs can be written to once, whereas Blu-ray Disc Recordable Erasable (BD-REs) can be erased and re-recorded multiple times. The current practical maximum speed for Blu-ray Discs is about 12× (54MB/s).: Higher speeds of rotation (5,+ rpm) cause too much wobble for the discs to be written properly, as with the 24× (MB/s) and 56× (MB/s, 11, rpm) maximum speeds, respectively, of standard DVDs and CDs. Since September , BD-RE is also available in the smaller 8cm Mini Blu-ray Disc size. 
On September 18, , Pioneer and Mitsubishi codeveloped BD-R LTH ("Low to High" in groove recording), which features an organic dye recording layer that can be manufactured by modifying existing CD-R and DVD-R production equipment, significantly reducing manufacturing costs. In February , Taiyo Yuden, Mitsubishi, and Maxell released the first BD-R LTH Discs, and in March , Sony's PlayStation 3 officially gained the ability to use BD-R LTH Discs with the firmware update. In May Verbatim/Mitsubishi announced the industry's first 6X BD-R LTH media, which allows recording a 25GB disc in about 16 minutes. Unlike with the previous releases of mm optical discs (i.e. CDs and standard DVDs), Blu-ray recorders hit the market almost simultaneously with Blu-ray's debut.
BD9 and BD5
The BD9 format was proposed to the Blu-ray Disc Association by Warner Home Video as a cost-effective alternative to the 25/50GB BD-ROM discs. The format was supposed to use the same codecs and program structure as Blu-ray Disc video but recorded onto less expensive GB dual-layer DVD. This red-laser media could be manufactured on existing DVD production lines with lower costs of production than the 25/50GB Blu-ray media.
Usage of BD9 for releasing content on "pressed" discs never caught on. With the end of the format war, manufacturers ramped production of Blu-ray Discs and lowered prices to compete with DVDs. On the other hand, the idea of using inexpensive DVD media became popular among individual users. A lower-capacity version of this format that uses single-layer GB DVDs has been unofficially called BD5. Both formats are being used by individuals for recording high-definition content in Blu-ray format onto recordable DVD media. Despite the fact that the BD9 format has been adopted as part of the BD-ROM basic format, none of the existing Blu-ray player models explicitly claim to be able to read it. Consequently, the discs recorded in BD9 and BD5 formats are not guaranteed to play on standard Blu-ray Disc players. AVCHD and AVCREC also use inexpensive media like DVDs, but unlike BD9 and BD5 these formats have limited interactivity, codec types, and data rates. As of March , BD9 was removed as an official BD-ROM disc.
The BDXL format allows GB and GB write-once discs, and GB rewritable discs for commercial applications. The BDXL specification was finalised in June but the first GB quad-layer discs were not released until November , and these discs are currently sold only in Japan. BD-R Format Specification (BDXL) defined a multi-layered disc recordable in BDAV format with the speed of 2× and 4×, capable of /GB and usage of UDF/ BD-RE Format Specification (BDXL) defined a multi-layered disc rewritable in BDAV with the speed of 2× and 4×, capable of GB and usage of UDF as file system. Although the 66 GB and GB BD-ROM discs used for Ultra HD Blu-ray use the same linear density as BDXL, the two formats are not compatible with each other, therefore it is not possible to use a triple layer BDXL disc to burn an Ultra HD Blu-ray disc playable in an Ultra HD Blu-ray player.
The IH-BD (Intra-Hybrid Blu-ray) format includes a 25GB rewritable layer (BD-RE) and a 25GB write-once layer (BD-ROM), designed to work with existing Blu-ray Discs.
Data format standards
Blu-ray Disc specifies the use of Universal Disk Format (UDF) as a convergent-friendly format for both PC and consumer electronics environments. It is used in the latest specifications of BD-ROM, BD-RE, and BD-R. In the first BD-RE specification (defined in ), the BDFS (Blu-ray Disc File System) was used. The BD-RE specification was defined mainly for the digital recording of high-definition television (HDTV) broadcast television. The BDFS was replaced by UDF in the second BD-RE specification in , in order to enable interoperability among consumer electronics Blu-ray recorders and personal computer systems. These optical disc recording technologies enabled PC recording and playback of BD-RE. BD-R can use UDF /
The Blu-ray Disc application for recording of digital broadcasting has been developed as System Description Blu-ray Rewritable Disc Format part 3 Audio Visual Basic Specifications (BDAV). The requirements related with computer file system have been specified in System Description Blu-ray Rewritable Disc Format part 2 File System Specifications version (BDFS). Initially, the BD-RE version (BDFS) was specifically developed for recording of digital broadcasts using the Blu-ray Disc application (BDAV application). But these requirements are superseded by the Blu-ray Rewritable Disc File System Specifications version (UDF) (a.k.a. RE ) and Blu-ray Recordable Disc File System Specifications version (UDF) (a.k.a. R ). Additionally, a new application format, BDMV (System Description Blu-ray Disc Prerecorded Format part 3 Audio Visual Basic Specifications) for High Definition Content Distribution was developed for BD-ROM. The only file system developed for BDMV is the System Description Blu-ray Read-Only Disc Format part 2 File System Specifications version (UDF) which defines the requirements for UDF 
Directory and file structure
All BDMV application files are stored under a "BDMV" directory.
- BDMV directory: contains the PLAYLIST, CLIPINF, STREAM, AUXDATA and BACKUP directories.
- PLAYLIST directory: contains the Database files for Movie PlayLists.
- xxxxx.mpls files: store information corresponding to Movie PlayLists. One file is created for each Movie PlayList. The filenames of these files are in the form "xxxxx.mpls", where "xxxxx" is a 5-digit number corresponding to the Movie PlayList.
- CLIPINF directory: contains the Database files for Clips.
- zzzzz.clpi files: store Clip information associated with a Clip AV stream file. The filenames of these files are in the form "zzzzz.clpi", where "zzzzz" is a 5-digit number corresponding to the Clip.
- STREAM directory: contains AV stream files.
- zzzzz.m2ts file: contains a BDAV MPEG-2 transport stream. The names of these files are in the form "zzzzz.m2ts", where "zzzzz" is a 5-digit number corresponding to the Clip. The same 5-digit number "zzzzz" is used for an AV stream file and its associated Clip information file.
- SSIF directory: If used, Stereoscopic Interleaved files shall be placed under this directory.
- zzzzz.ssif file: is a Stereoscopic Interleaved file that is composed from two BDAV MPEG-2 transport streams. Both of the streams include an MPEG-4 MVC view video stream for left eye or right eye respectively. This file is used only when 3D video is played back. The 5-digit number "zzzzz" is the same as the number used for the AV stream file "zzzzz.m2ts" that includes the MPEG-4 MVC Base view video stream.
- AUXDATA directory: contains Sound data files and Font files.
- sound.bdmv file: stores data relating to one or more sounds associated with HDMV Interactive Graphic streams applications. This file may or may not exist under the AUXDATA directory. If it exists, there shall be only one sound.bdmv file.
- aaaaa.otf file: stores the font information associated with Text subtitle applications. The names of these files are in the form "aaaaa.otf", where "aaaaa" is a 5-digit number corresponding to the Font.
- BACKUP directory: contains copies of the "index.bdmv" file, the "MovieObject.bdmv" file, all the files in the PLAYLIST directory and all files in the CLIPINF directory.
- index.bdmv file: stores information describing the contents of the BDMV directory. There is only one index.bdmv file under the BDMV directory.
- MovieObject.bdmv file: stores information for one or more Movie Objects. There is only one MovieObject.bdmv under the BDMV directory.
- PLAYLIST directory: contains the Database files for Movie PlayLists.
Audio, video, and other streams are multiplexed and stored on Blu-ray Discs in a container format based on the MPEG transport stream. It is also known as BDAV MPEG-2 transport stream and can use filename extension .m2ts. Blu-ray Disc titles authored with menus are in the BDMV (Blu-ray Disc Movie) format and contain audio, video, and other streams in BDAV container. There is also the BDAV (Blu-ray Disc Audio/Visual) format, the consumer oriented alternative to the BDMV format used for movie releases. The BDAV format is used on BD-REs and BD-Rs for audio/video recording. BDMV format was later defined also for BD-RE and BD-R (in September , in the third revision of BD-RE specification and second revision of BD-R specification).
Blu-ray Disc employs the MPEG transport stream recording method. That enables transport streams of digital broadcasts to be recorded as they are broadcast, without altering the format. It also enables flexible editing of a digital broadcast that is recorded as is and where the data can be edited just by rewriting the playback stream. Although it is quite natural, a function for high-speed and easy-to-use retrieval is built in. Blu-ray Disc Video use MPEG transport streams, compared to DVD's MPEG program streams. An MPEG transport stream contains one or more MPEG program streams, so this allows multiple video programs to be stored in the same file so they can be played back simultaneously (e.g. with "picture-in-picture" effect).
The BD-ROM specification mandates certain codec compatibilities for both hardware decoders (players) and movie software (content).Windows Media Player does not come with the codecs required to play Blu-ray Discs.
Originally, BD-ROMs stored video up to × pixel resolution at up to 60 () fields per second. Currently, with UHD BD-ROM, videos can be stored at a maximum of × pixel resolution at up to 60 () frames per second, progressively scanned. While most current Blu-ray players and recorders can read and write × video at the full p and 50p progressive format, new players for the UHD specifications will be able to read at × video at either p and 50p formats.
|Display aspect ratio|
|4K UHD[a]||× 60p|
|SD||× i||or [c]|
|× 25i||or [c]|
^ a Only supported on UltraHD Blu-ray with HEVC video compression standard.
^ b MPEG-2 at × was previously not included in a draft version of the specification from March 
^ c These resolutions are stored anamorphically, i.e. they are stretched to the display aspect ratio by the player or display.
For video, all players are required to process H/MPEG-2 Part 2, H/MPEG-4 Part AVC, and SMPTEVC BD-ROM titles with video must store video using one of the three mandatory formats; multiple formats on a single title are allowed. Blu-ray Disc allows video with a bit depth of 8-bits per color YCbCr with chroma subsampling. The choice of formats affects the producer's licensing/royalty costs as well as the title's maximum run time, due to differences in compression efficiency. Discs encoded in MPEG-2 video typically limit content producers to around two hours of high-definition content on a single-layer (25GB) BD-ROM. The more-advanced video formats (VC-1 and MPEG-4 AVC) typically achieve a video run time twice that of MPEG-2, with comparable quality.
MPEG-2 was used by many studios (including Paramount Pictures, which initially used the VC-1 format for HD DVD releases) for the first series of Blu-ray Discs, which were launched throughout  Modern releases are now often encoded in either MPEG-4 AVC or VC-1, allowing film studios to place all content on one disc, reducing costs and improving ease of use. Using these formats also frees a lot of space for storage of bonus content in HD (i/p), as opposed to the SD (i/p) typically used for most titles. Some studios, such as Warner Bros., have released bonus content on discs encoded in a different format than the main feature title. For example, the Blu-ray Disc release of Superman Returns uses VC-1 for the feature film and MPEG-2 for some of its bonus content. Today[when?], Warner and other studios typically provide bonus content in the video format that matches the feature.
For audio, BD-ROM players are required to implement Dolby Digital (AC-3), DTS, and linear PCM. Players may optionally implement Dolby Digital Plus and DTS-HD High Resolution Audio as well as lossless formats Dolby TrueHD and DTS-HD Master Audio. BD-ROM titles must use one of the mandatory schemes for the primary soundtrack. A secondary audiotrack, if present, may use any of the mandatory or optional codecs.
|LPCM (uncompressed)||Dolby Digital||Dolby Digital Plus||Dolby TrueHD (lossless)||DTS Digital Surround||DTS-HD Master Audio (lossless)||DRA||DRA extension|
|Max. channel||8(48kHz, 96kHz), 6(kHz)||8(48kHz, 96kHz), 6(kHz)||8(48kHz, 96kHz), 6(kHz)|
|Bits/sample||16, 20, 24||16, 24||16, 24||16, 24||16, 20, 24||16, 24||16||16|
|Sample frequency||48kHz, 96kHz, kHz||48kHz||48kHz||48kHz, 96kHz, kHz||48kHz||48kHz, 96kHz, kHz||48kHz||48kHz, 96kHz|
For users recording digital television programming, the recordable Blu-ray Disc standard's initial data rate of 36Mbit/s is more than adequate to record high-definition broadcasts from any source (IPTV, cable/satellite, or terrestrial). BD Video movies have a maximum data transfer rate of 54Mbit/s, a maximum AV bitrate of 48Mbit/s (for both audio and video data), and a maximum video bit rate of 40Mbit/s. This compares to HD DVD movies, which have a maximum data transfer rate of 36Mbit/s, a maximum AV bitrate of Mbit/s, and a maximum video bitrate of Mbit/s.
Java software interface
Main article: BD-J
At the JavaOne trade show, it was announced that Sun Microsystems' Java cross-platform software environment would be included in all Blu-ray Disc players as a mandatory part of the standard. Java is used to implement interactive menus on Blu-ray Discs, as opposed to the method used on DVD-video discs. DVDs use pre-rendered MPEG segments and selectable subtitle pictures, which are considerably more primitive and rarely seamless. At the conference, Java creator James Gosling suggested that the inclusion of a Java virtual machine, as well as network connectivity in some BD devices, will allow updates to Blu-ray Discs via the Internet, adding content such as additional subtitle languages and promotional features not included on the disc at pressing time. This Java Version is called BD-J and is built on a profile of the Globally Executable MHP (GEM) standard; GEM is the worldwide version of the Multimedia Home Platform standard.
The BD-ROM specification defines four Blu-ray Disc player profiles, including an audio-only player profile (BD-Audio) that does not require video decoding or BD-J. All of the video-based player profiles (BD-Video) are required to have a full implementation of BD-J.
|Grace Period[d]||Bonus View||BD-Live[e]||Blu-ray 3D|
|Built-in persistent memory||Unneeded||64 KB||64 KB||64 KB||64 KB?|
|Local storage capability[a]||Unneeded||Optional||MB||1 GB||1 GB|
|Secondary video decoder (PiP)||No video||Optional||Mandatory||Mandatory||Mandatory|
|Secondary audio decoder[b]||Optional||Optional||Mandatory||Mandatory||Mandatory|
|Virtual file system||Unneeded||Optional||Mandatory||Mandatory||Mandatory|
|Internet connection capability||No||No||No||Mandatory||Mandatory|
^ a This is used for storing audio/video and title updates. It can either be built-in memory or removable media, such as a memory card or USB flash memory.
^ b A secondary audio decoder is typically used for interactive audio and commentary.
^ c Profile is a separate audio-only player profile. The first Blu-ray Disc album to be released was Divertimenti, by record label Lindberg Lyd, and it has been confirmed to work on the PS3.
^ d Also known as Initial Standard profile.
^ e Also known as Final Standard profile.
On November 2, , the Grace Period Profile was superseded by Bonus View as the minimum profile for new BD-Video players released to the market. When Blu-ray Disc software not authored with interactive features dependent on Bonus View or BD-Live hardware capabilities is played on Profile players, it is able to play the main feature of the disc, but some extra features may not be available or will have limited capability.
The biggest difference between Bonus View and BD-Live is that BD-Live requires the Blu-ray Disc player to have an Internet connection to access Internet-based content. BD-Live features have included Internet chats, scheduled chats with the director, Internet games, downloadable featurettes, downloadable quizzes, and downloadable movie trailers. While some Bonus View players may have an Ethernet port, it is used for firmware updates and is not used for Internet-based content. In addition, Profile also requires more local storage in order to handle this content.
Profile players are not eligible for Bonus View or BD-Live compliant upgrades and do not have the function or capability to access these upgrades, with the exception of the latest players and the PlayStation 3. Internet is required to use.
As with the implementation of region codes for DVDs, Blu-ray Disc players sold in a specific geographical region are designed to play only discs authorized by the content provider for that region. This is intended to permit content providers (motion picture studios, television production company etc.) to enact regional price discrimination and/or exclusivecontent licensing. According to the Blu-ray Disc Association, all Blu-ray Disc players and Blu-ray Disc-equipped computer systems are required to enforce regional coding. However, content providers need not use region playback codes. Some current estimates suggest 70% of available movie Blu-ray Discs from the major studios are region-free and can therefore be played on any Blu-ray Disc player in any region.
Movie distributors have different region coding policies. Among major U.S. studios, Walt Disney Pictures, Warner Bros., Paramount Pictures, Universal Studios, and Sony Pictures have released most of their titles free of region coding.MGM and Lions Gate Entertainment have released a mix of region-free and region-coded titles.20th Century Fox released most of their titles region-coded pre-Disney merger.Most of their post-Disney merger content is region-free, however. Vintage film restoration and distribution company The Criterion Collection uses US region coding in all Blu-ray releases, with their releases in the UK market using UK region coding.
The Blu-ray Disc region coding scheme divides the world into three regions, labeled A, B, and C.
|A||Americas, Hong Kong SAR, Japan, North Korea, South Korea, Macau SAR, Singapore, Taiwan, Oceania excluding Australia and New Zealand, Southeast Asia.|
|B||Africa, Middle East, Southwest Asia, most of Europe (excluding Belarus, Russia, Ukraine, Moldova), Australia, New Zealand.|
|C||Central Asia, mainland China, Mongolia, Indian subcontinent, Belarus, Russia, Ukraine, Kazakhstan, Moldova.|
|FREE||Informal term meaning "worldwide". Region free is not an official setting; discs that bear the region FREE symbol either have no flags set or have all three flags set. Discs with no flags set may not play in some non-compliant players.|
A new form of Blu-ray region coding tests not only the region of the player/player software, but also its country code, repurposing a user setting intended for localization (PSR19) as a new form of regional lockout. This means, for example, while both the US and Japan are Region A, some American discs will not play on devices/software configured for Japan or vice versa, since the two countries have different country codes. (For example, the United States is "US" ( or hex 0x), Japan is "JP" ( or hex 0x4a50), and Canada is "CA" ( or hex 0x).) Although there are only three Blu-ray regions, the country code allows much more precise control of the regional distribution of Blu-ray Discs than the six (or eight) DVD regions. With Blu-ray Discs, there are no "special regions" such as the regions 7 and 8 for DVDs.
In circumvention of region coding restrictions, stand-alone Blu-ray Disc players are sometimes modified by third parties to allow for playback of Blu-ray Discs (and DVDs) with any region code. Instructions ("hacks") describing how to reset the Blu-ray region counter of computer player applications to make them multi-region indefinitely are also regularly posted to video enthusiast websites and forums. Unlike DVD region codes, Blu-ray region codes are verified only by the player software, not by the optical drive's firmware.
The latest types of Blu-ray players, suitable for UltraHD content, are not region-free; however; the UHD discs for which they are designed have not been coded to be locked to any region, and will work worldwide.
Digital rights management
The Blu-ray Disc format employs several layers of digital rights management (DRM) which restrict the usage of the discs. This has led to extensive criticism of the format by organizations opposed to DRM, such as the Free Software Foundation, and consumers because new releases require player firmware updates to allow disc playback.
High-bandwidth Digital Content Protection
Main article: High-bandwidth Digital Content Protection
Blu-ray equipment is required to implement the High-bandwidth Digital Content Protection (HDCP) system to encrypt the data sent by players to rendering devices through physical connections. This is aimed at preventing the copying of copyrighted content as it travels across cables. Through a protocol flag in the media stream called the Image Constraint Token (ICT), a Blu-ray Disc can enforce its reproduction in a lower resolution whenever a full HDCP-compliant link is not used. In order to ease the transition to high definition formats, the adoption of this protection method was postponed until 
Advanced Access Content System
Main article: Advanced Access Content System
The Advanced Access Content System (AACS) is a standard for content distribution and digital rights management. It was developed by AS Licensing Administrator, LLC (AACS LA), a consortium that includes Disney, Intel, Microsoft, Panasonic, Warner Bros., IBM, Toshiba, and Sony. Since the appearance of the format on devices in , several successful attacks have been made on it. The first known attack relied on the trusted client problem. In addition, decryption keys have been extracted from a weakly protected player (WinDVD). Since keys can be revoked in newer releases, this is only a temporary attack, and new keys must continually be discovered in order to decrypt the latest discs.
Main article: BD+
BD+ was developed by Cryptography Research Inc. and is based on their concept of Self-Protecting Digital Content. BD+, effectively a small virtual machine embedded in authorized players, allows content providers to include executable programs on Blu-ray Discs. Such programs can:
- Examine the host environment to see if the player has been tampered with. Every licensed playback device manufacturer must provide the BD+ licensing authority with memory footprints that identify their devices.
- Verify that the player's keys have not been changed
- Execute native code, possibly to patch an otherwise insecure system
- Transform the audio and video output. Parts of the content will not be viewable without letting the BD+ program unscramble it.
If a playback device manufacturer finds that its devices have been hacked, it can potentially release BD+ code that detects and circumvents the vulnerability. These programs can then be included in all new content releases. The specifications of the BD+ virtual machine are available only to licensed device manufacturers. A list of licensed commercial adopters is available from the BD+ website.
The first titles using BD+ were released in October Since November , versions of BD+ protection have been circumvented by various versions of the AnyDVD HD program. Other programs known to be capable of circumventing BD+ protection are DumpHD (versions and above, along with some supporting software), MakeMKV, and two applications from DVDFab (Passkey and HD Decrypter).
Main article: BD-ROM Mark
ROM Mark is a small amount of cryptographic data that is stored separately from normal Blu-ray Disc data, aiming to prevent replication of the discs. The cryptographic data is needed to decrypt the copyrighted disc content protected by AACS. A specially licensed piece of hardware is required to insert the ROM Mark into the media during mastering. During replication, this ROM Mark is transferred together with the recorded data to the disc. In consequence, any copies of a disc made with a regular recorder will lack the ROM Mark data and will be unreadable on standard players.
The Blu-ray Disc Association recommends but does not require that Blu-ray Disc drives be capable of reading standard DVDs and CDs, for backward compatibility. Most Blu-ray Disc players are capable of reading both CDs and DVDs; however, a few of the early Blu-ray Disc players released in , such as the Sony BDP-S1, could play DVDs but not CDs. In addition, with the exception of some early models from LG and Samsung, Blu-ray players cannot play HD DVDs, and HD DVD players cannot play Blu-ray Discs. Some Blu-ray players can also play Video CDs, Super Audio CDs, and/or DVD-Audio discs. All Ultra HD Blu-ray players can play regular Blu-ray Discs, and most can play DVDs and CDs. The PlayStation 4 and PlayStation 5 do not support CDs.
High Fidelity Pure Audio (BD-A)
Main article: High Fidelity Pure Audio Blu-ray
High Fidelity Pure Audio (HFPA) is a marketing initiative, spearheaded by the Universal Music Group, for audio-only Blu-ray optical discs. Launched in as a potential successor to the compact disc, it has been compared with DVD-A and SACD, which had similar aims.
Main article: AVCHD
AVCHD was originally developed as a high-definition format for consumer tapelesscamcorders. Derived from the Blu-ray Disc specification, AVCHD shares a similar random access directory structure but is restricted to lower audio and video bitrates, simpler interactivity, and the use of AVC-video and Dolby AC-3 (or linear PCM) audio. Being primarily an acquisition format, AVCHD playback is not universally recognized among devices that play Blu-ray Discs. Nevertheless, many such devices are capable of playing AVCHD recordings from removable media, such as DVDs, SD/SDHC memory cards, "Memory Stick" cards, and hard disk drives.
Main article: AVCREC
AVCREC uses a BDAV container to record high-definition content on conventional DVDs. Presently AVCREC is tightly integrated with the Japanese ISDB broadcast standard and is not marketed outside of Japan. AVCREC is used primarily in set-top digital video recorders and in this regard it is comparable to HD REC.
The Blu-ray Disc Association (BDA) created a task force made up of executives from the film industry and the consumer electronics and IT sectors to help define standards for putting 3D film and 3D television content on a Blu-ray Disc. On December 17, , the BDA officially announced 3D specs for Blu-ray Disc, allowing backward compatibility with current 2D Blu-ray players, though compatibility is limited by the fact that the longer 3D discs are triple-layer, which normal (2D only) players cannot read. The BDA has said, "The Blu-ray 3D specification calls for encoding 3D video using the "Stereo High" profile defined by Multiview Video Coding (MVC), an extension to the ITU-T H Advanced Video Coding (AVC) codec currently implemented by all Blu-ray Disc players. MPEG4-MVC compresses both left and right eye views with a typical 50% overhead compared to equivalent 2D content, and can provide full p resolution backward compatibility with current 2D Blu-ray Disc players." This means the MVC (3D) stream is backward compatible with H/AVC (2D) stream, allowing older 2D devices and software to decode stereoscopic video streams, ignoring additional information for the second view. However, some 3D discs have a user limitation set preventing the disc from being viewed in 2D (though a 2D disc is often included in the packaging).
Sony added Blu-ray 3D support to its PlayStation 3 console via a firmware upgrade on 21 September  The console had previously gained 3D gaming capability via an update on 21 April  Since the version software update on August 9, , the PlayStation 3 can play DTS-HD Master Audio and DTS-HD High Resolution Audio while playing 3D Blu-ray.Dolby TrueHD is used on a small minority of Blu-ray 3D releases, and bitstreaming implemented in slim PlayStation 3 models only (original "fat" PS3 models decode internally and send audio as LPCM). The PlayStation VR can also be used to watch these movies in 3D on a PlayStation 4. As of , most major home entertainment studios, such as Walt Disney Studios, Sony Pictures, MGM, and Universal Pictures had discontinued the Blu-ray 3D format in North America, but continued to produce and sell them in other regions such as South America, Europe, Asia, and Australia. Paramount Pictures has ceased sales and productions of 3D Blu-ray discs all over the world, its last 3D releases being Ghost in the Shell and Transformers: The Last Knight, while Warner Bros. still continues to sell and produce 3D Blu-ray discs to this day in all regions, notable titles including: Wonder Woman, Blade Runner , Justice League, Tomb Raider, Rampage, Aquaman, The Lego Movie 2: The Second Part, Shazam!, and Godzilla: King of the Monsters.
Ultra HD Blu-ray
Main article: Ultra HD Blu-ray
Ultra HD Blu-ray discs are incompatible with existing standard Blu-ray players. They support 4KUHD ( × pixel resolution) video at frame rates up to 60 progressive frames per second, encoded using High-Efficiency Video Coding. The discs support both high dynamic range by increasing the color depth to bit per color and a greater color gamut than supported by conventional Blu-ray video by using the Rec. color space.
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DVD replaced VHS, then Blu-ray came along in all its HD glory and now we have 4K Blu-ray taking the crown as the highest-resolution disc you can get – until 8K Blu-rays come along at some point.
These discs look alike and are the same physical size, so should you be rushing out to replace your film collection every time a new format comes out? Let's look at the differences.
Just want a great 4K or HD Blu-ray player? Use our Blu-ray player reviews to find out which models are worth your money.
The main differences between DVD, Blu-ray and 4K Blu-ray
The difference between the three different types of disc is how much data you can store on them. They're all the same physical CD-size we've been used to for years, regardless of the format.
Think of a movie or a TV show as a file on your computer – the higher the resolution, the sharper the image and the more space it takes up on the disc:
- DVD Max resolution p, also known as SD (standard definition)
- Blu-ray Max resolution p, also known as HD (high definition)
- 4K Blu-ray Max resolution p, also known as 4K.
4K resolution films take up a massive amount of memory when compared with a p DVD file and you could never fit one on to a DVD disc. But a higher resolution doesn't necessarily mean great picture quality (keep reading to find out more).
Higher resolution makes for a sharper image, that's a given. But when it comes to colour and contrast, things are less certain.
How a film is mastered for each format makes a difference to the quality. A Blu-ray version of a film could have rich, vivid colours and a finely balanced contrast, while the 4K version could look washed out and bland. This is more of an issue when an older film that was never released in 4K, or even HD, before is remastered to take advantage of the higher-resolution format. If the remastering is done poorly, then you'll notice the problems with colour and contrast.
4K Blu-rays also add HDR (High Dynamic Range) into the mix. This technology boosts contrast, creating a greater range between bright and dark parts of the screen – to find out more, go to what is HDR TV.
It's a hit and miss technology, though. When used badly it can make the picture too dark or bright, which blocks all that lovely 4K detail.
Our Blu-ray player reviews take these factors into account, so you can buy one that will make the most of your film collection. But sometimes the fault can lie with the Blu-ray itself.
4K Blu-rays tend to have more advanced audio processing and formats, such as Dolby Atmos, DTS:X and other formats that allow for less compression of the sound. Which should mean higher quality.
These processing technologies could feasibly be on Blu-rays and DVDs, too, but often they are saved for the 4K releases.
The back of a Blu-ray box will tell you what audio formats and processing is on the disc.
Can you play Blu-rays on a DVD player or do you need a different device?
If you have a DVD player, then you'll only be able to play DVDs. But Blu-ray players and 4K Blu-ray players are usually backwards compatible with the lower-resolution discs.
- DVD players only play DVDs
- Blu-ray players play p (HD) Blu-rays and sometimes DVDs
- 4K Blu-ray players play 4K Blu-rays, p (HD) Blu-rays and sometimes DVDs.
It's not always the case that a player will be able to play lower-resolution discs, so it's worth checking our Blu-ray player reviews or the store listing before you buy.
Which type of DVD or Blu-ray player should you buy?
Not a DVD player, there's really no point. Very few are still made and we don't test them any more.
Ideally, you should buy a 4K Blu-ray player. Despite some 8K TVs now being released, 4K will be the main resolution used by the TV and film industry for years to come.
If you don't have a 4K TV already, then it's likely that you will when you next upgrade, and a 4K Blu-ray player will let you make the most of the display, as well as let you watch your existing Blu-ray and DVD collection if you choose the right model - use our TV reviews to help you.
4K Blu-ray players are still expensive, though, so don't rush out to buy one if you're not mad keen on buying films at the highest resolution available. The cheapest we've tested is around £, while a good-quality HD Blu-ray player for around £
As 4K Blu-ray players and discs become more common the costs will come down. This happened when Blu-ray was taking over from DVD. Blu-ray discs and players cost a fortune during the transition, but now they cost roughly what DVDs and players did then.
See our pick of the best Blu-ray players for a steer on which to buy.
Top 10 Blu-ray movies / Best looking Blu-ray movies
So, you’ve finally splurged out on that brand-spanking HD home theatre to wow your friends with – along with any strangers who happen to pass by your house window. (Try not to stare as they press their noses forlornly to the glass: you’ll only be encouraging them.)
The next step on your road to high-def glory is to stock up on some Blu-ray movies. After all, a home theatre system is only as impressive as the discs you throw at it. (Note: we don’t mean in a Frisbee like manner. That would just be impractical.) Like a supermodel splayed gratuitously over a sports car|Terrible celebrity endorsements: What Lara Bingle, Snoop Dogg and Mr T have in common, a good Blu-ray movie lends an essential decorative air to your hardware. In some ways, it’s the most important purchase of all.
While all Blu-ray movies share identical p video resolution; some discs are ‘more equal’ than others. Indeed, certain earlier releases barely look any better than a standard-def DVD (Total Recall, we’re looking at you.) A true videophile needs to pick his discs wisely.
In the following slideshow, we take a look at some of the best looking Blu-ray movies currently troubling store shelves. We’ve tried to include films that not only look fantastic, but are also entertaining in their own right. (It’s not all about the eye candy – otherwise you could just watch Transformers 2 on a loop, forever.)
To make life easier, we’ve also included links to where you can buy each disc online, plus the original theatrical trailers. Truly we are the caliphs of audiovisual dissemination.
Blu ray discs buy
And since the first person is me, now I am your master. - Not. We have not yet had a full-fledged contact. You have to take my virginity, only then the program will work. - So you're a virgin.Blu-ray / Dvd Tuesday Shopping 10/12/21 : My Blu-ray Collection Series
Oksana shouted back. - Okay, Oksanochka, then I'll put on a light suit and white shoes. - Great daddy, you and I will be like, yin, and, yang, I personify evil, and therefore you are good.
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Are you ashamed. Well, I promised. And then it will be even more ashamed.