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					   Blu-ray is the next-generation digital video disc. It can record,
    store and play back high-definition video and digital audio, as
    well as computer data. The advantage to Blu-ray is the sheer
    amount of information it can hold.

   Blue-ray also known as Blu-ray Disc (BD) is the name of a next
    generation optical disc format jointly developed by the Blu-ray
    Disc Associations (BDA), a group of leading consumer electronics
    and PC companies (including Apple, Dell, Hitachi, HP, JVC, LG,
    Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony,
    TDK, and Thomson).

   The format was developed to enable recording, rewriting and
    playback of high-definition video (HD), as well as storing large
    amounts of data.
    The name Blu-ray is derived which utilizes a blue-violet
    laser to read and write data. The name is a combination of
    "Blue" and optical ray "Ray". According to the Blu-ray Disc
    Association, the spelling of "Blu-ray" is not a mistake. The
    character "e" is intentionally left out because a daily-used
    term can't be registered as a trademark.
•   As with conventional CDs and DVDs, Blu-ray plans to provide a
    wide range of formats including ROM/R/RW. The following
    formats are part of the Blu-ray Disc specification:
•   BD-ROM - read-only format for software, games and movie
    distribution.
    BD-R - recordable format for HDTV recording and PC data
    storage.
    BD-RE - rewritable format for HDTV recording and PC data
    storage
•   According to the Blu-ray Disc v1.0 specification, 1x speed will
    require a 36.5Mbps data transfer rate, which means it will take
    about 1 hour and 33 minutes to record 25GB. The Blu-ray Disc
    Association are currently working on the v2.0 specification, which
    will support 2x speed to cut the time it takes to copy content from
    one disc to another in half. In the future, the data transfer rate is
    expected to be raised to 8x or more.
 Due  to the fact that the data layer on a Blu-ray Disc
 is placed much "closer" to the laser lens than in DVD
 (or even the HD-DVD proposal), there is less
 distortion resulting in significantly improved
 tolerances. Hence, more precision and ultra high
 storage densities are made possible.
   Single layer: 25 GB
    Dual layer: 50 GB        Disc Characteristics
   Diameter: 120 mm
   Thickness: 1.2 mm
   Center hole
    diameter: 15 mm
   Uses GaN laser of
    wavelength 400 nm
   The smaller laser,
    compared to the
    DVD and CD,
    keeps the process     Courtesy Blu-ray Disc Founders “Blu-ray Disc Format White Paper”

    more efficient (~5
    mW)
               Disc Characteristics
   The power
    conservation allows
    the development of
    multi-layer
    platforms and high-
    speed recording
   BD-ROM: read-
    only format
   BD-R and BD-RE:
    recordable formats
    (RE: rewritable; R:
    recordable once)      Courtesy Blu-ray Disc Founders “Blu-ray Disc Format White Paper”
                         Compatibility
   This issue has introduced a competitor, the HD-DVD, that
    based its technology around being compatible with the DVD
   Recently the BDA has developed recorders that are
    BD/DVD/CD compatible
   JVC has advanced the BD by developing a BD/DVD combo
    disc that stores both DVD and BD data. It is composed of two
    DVD layers and a third BD layer storing 33.5 GB total




               Courtesy <http://www.jvc-victor.co.jp/english/press/2004/bd-dvd.html>
              Protection System
   HDTV contains a copyright bit that is detected by
    the BD recorder. If the broadcast has no copyright
    bit, then the BD recorder is allowed to store the
    information
   Uses the Data Encryption Standard (DES) that has
    a key length of 56 bits
   A Key Block and Disc ID are written into the ROM
    area to prevent illegal copying
High-Density Digital Versatile Disc (HD-DVD)
 Advantages:
       The name itself, HD-DVD, is far more consumer-friendly
  than Blu-ray. HD-DVDs carry the same basic structure as current
  DVDs, so converting existing DVD manufacturing lines into
  HD-DVD lines is supposedly simple and cost effective. Memory-
  Tech, a leading Japanese manufacturer of optical media, stated
  that producing HD-DVD discs would initially cost only 10
  percent more than for existing DVDs and that it could quickly
  bring the cost down to match that of standard DVD.
   Disadvantages:
                     HD-DVD simply can't boast the same storage capacity as Blu-ray. It's
    confusing, but it appears that the rewritable HD-DVD-RW will go up 32GB, while the
    recordable HD DVD-R discs will only be single layer (15GB). The other downside is that
    with Sony holding the rights to Columbia Pictures and MGM movie
High-Density Digital Versatile Disc (HD-DVD)

   Disadvantages:

    HD-DVD simply can't boast the same storage capacity as Blu-ray.
    It's confusing, but it appears that the rewritable HD-DVD-RW
    will go up 32GB, while the recordable HD DVD-R discs will only
    be single layer (15GB). The other downside is that with Sony
    holding the rights to Columbia Pictures and MGM movie
                     Enhancements
   Error rates increased in reading and writing after the
    original BD suffered scratches and fingerprints
   For protection, the prototype BD was enclosed in a
    case
   The case increased the size of the disc drive




               Courtesy Blu-ray Disc Founders “Blu-ray Disc Format White Paper”
   A hard coat was        Enhancements
    derived of an
    ultraviolet-
    curable resin that
    has a scratch
    resistance similar
    to the DVD
   An artificial
    fingerprint
    reagent is placed
    on the disc          Courtesy Blu-ray Disc Founders “Blu-ray Disc Format White Paper”


    surface to resist
    fingerprint oils

				
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Description: this ppt is on blu-ray disc it give basic information of BD(blu-ray disc)
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