
Bye bye HD-DVD… Move over Blu-Ray… Holographic Versatile Discs are on the way!
Way back in 2004, many technology companies started toying around with the idea of a holographic disk to usher in a new generation of media. Well in June of 2007, Ecma International revealed a 100GB version, the first of its kind.
It has been estimated that a single HVD will be able to hold a total of 3.9 terabytes of information, which equates to up to 11,900 hours of MPEG-4 quality video, or about the entire text contained in the Library of Congress on about six discs.
Here is an excerpt from Wikipedia.org:
Holographic Versatile Disc (HVD) is an optical disc technology that would hold up to 3.9 terabytes (TB) of information. It employs a technique known as collinear holography, whereby two lasers, one red and one green, 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 while the red laser is used as the reference beam and to read servo information from a regular CD-style aluminum layer near the bottom. Servo information 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 servo information 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.[1] These discs have the capacity to hold up to 3.9 terabytes (TB) of information, which is approximately 5,800 times the capacity of a CD-ROM, 850 times the capacity of a DVD, 160 times the capacity of single-layer Blu-ray Discs, and about 4 times the capacity of the largest computer hard drives as of 2007. The HVD also has a transfer rate of 1 Gbit/s (128 MB/s). Optware was expected to release a 200 GB disc in early June 2006, and Maxell in September 2006 with a capacity of 300GB and transfer rate of 20 MB/s. On June 28 , 2007, HVD standards have been approved and published.
Don’t expect this holographic media to be available any time this year… or the next. The technology is still in its early stages and is very expensive. As of now a drive to read these discs would cost somewhere in the area of USD $15,000, and a single disc around $120-$180.
Share This