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Message: <blockquote data-quote="Core" data-source="post: 9074171" data-attributes="member: 263471"><img src="http://2.bp.blogspot.com/_5lL1y9ELMFM/R8KD7B0lFZI/AAAAAAAACF8/WMLCtoMNo6Y/s400/HVD_logo.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://av.watch.impress.co.jp/docs/20050203/opt01.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> DISK <img src="http://www.audioholics.com/images/hvddisc.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Comparison The Holographic Versatile Disc (HVD) is an optical disc  technology developed between April 2004 and mid-2008 which can store  the same amount of information as roughly twenty Blu-ray discs. It employs a technique known as collinear holography, whereby a green and red laser beam are collimated in a single beam. The green laser reads data encoded as laser interference fringes from a holographic layer near the top of the disc. A red laser is used as the reference beam to read servoinformation from a regular CD-style aluminum  layer near the bottom. Servoinformation is used to monitor the position  of the read head over the disc, similar to the head, track, and sector  information on a conventional hard disk drive. On a CD or DVD this servoinformation is interspersed amongst the data. A dichroic mirror layer between the holographic data and the servo data reflects the green laser while letting the red laser pass through. This prevents interference from refraction of the green  laser off the servo data pits and is an advance over past holographic  storage media, which either experienced too much interference, or lacked  the servo data entirely, making them incompatible with current CD and  DVD drive technology.These discs have the capacity to hold up to 6 terabytes (TB) of information. The HVD also has a transfer rate of 1 Gbit/s (125 MB/s). Sony, Philips,  TDK, Panasonic, and Optware all plan to release 1 TB capacity discs in  2019 while Maxell plan one for early 2020 with a capacity of 500 GB and  transfer rate of 20 MB/s—although HVD standards were approved and published on June 28, 2007, no company has released an HVD as of December 2010.Media type     Ultra-high density optical discEncoding       MPEG-2, MPEG-4 AVC (H.264), NGVC (H.265) and VC-1Capacity       6 TBDeveloped     by  HSD ForumUsage          Data storage,High-definition video, Quad HD & the possibility of Ultra HD<a href="http://www.edepot.com/playstation4.html" target="_blank">http://www.edepot.com/playstation4.html</a>there is a rumor it will be shipped with PlayStation 4 according to this site</blockquote>

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