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    Blu-ray Disc

    March 7, 2005

    James Huguenin-Love

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    Evolution

    Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper

    VHS: analogDVD: digitalBD: high-definition

    Enables recording,

    rewriting, andplayback of high-definition video

    Capable of storing

    information thatthe DVD and CDare not capable ofholding

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    Foundation

    Blu-ray disc (BD) is appropriately named afterthe blue laser used to write the data

    The first blue laser was developed in 1996 by

    Shuji Nakamura (Nichia Corporation) In 2002, an alliance was formed, called the

    Blu-ray Disc Association, including the likesof Sony, Samsung, Sharp, Hewlett-Packard,

    and Royal Phillips The e is intentionally left out of the name

    due to trademark restrictions

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    Disc Characteristics

    Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper

    The powerconservationallows thedevelopment ofmulti-layer

    platforms andhigh-speedrecording

    BD-ROM: read-only format

    BD-R and BD-RE:recordable formats(RE: rewritable; R:recordable once)

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    Disc Characteristics

    Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper

    Numerical Aperature measures the ability of a lens togather and focus light. As the numerical aperture

    increases, the focusing power increases and the beamsize decreases Phase change implies that the disc section is either an

    amorphous or crystalline state. The reflectivity changesaccordingly thus representing a binary bit

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    Recorder Characteristics

    Over two hours of HDTV can be placed on asingle layer BD, which correlates to over 13hours for standard TV

    The transfer rate is 36 megabits per second

    At 1x speed, it takes approximately 1.5 hoursto record an entire single layer BD

    Recorder Cost: $1,500 - $2,500; BD Cost:$26

    Expected to be available in the U.S. by 2006

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    Compatibility

    Courtesy

    This issue has introduced a competitor, the HD-DVD, that based itstechnology around being compatible with the DVD

    Recently the BDA has developed recorders that are BD/DVD/CDcompatible

    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 athird BD layer storing 33.5 GB total

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    Protection System

    HDTV contains a copyright bit that isdetected by the BD recorder. If the broadcasthas no copyright bit, then the BD recorder isallowed 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 theROM area to prevent illegal copying

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    Enhancements

    Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper

    Error rates increased in reading and writing after theoriginal BD suffered scratches and fingerprints

    For protection, the prototype BD was enclosed in a case

    The case increased the size of the disc drive

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    Enhancements

    Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper

    A hard coat wasderived of anultraviolet-curableresin that has a

    scratch resistancesimilar to the DVD

    An artificialfingerprint reagentis placed on thedisc surface toresist fingerprintoils

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    Future

    Expect the BD to become more prevalentonce the HDTV market establishes itspresence

    Audio and video will reach higher qualitieswith larger storage space

    Look for BD with more than two layers as the

    technology is further refined