Holographic Versatile disk

the Holographic Versatile disk HVD mentioned is a storage medium, which can be read and described by lasers.

The HVD Logo
structure of the Holographic Versatile disk
1. greener write/read laser (532nm)
2. red positioning/addressing laser (650nm)
3. Hologram (data)
4. Polycarbon layer
5. Photopolymeri layer (data medium layer)
6. Distance layers
7. Dichroic layer (green light) 8
reflects. Aluminum reflektiv layer (red light) 9
reflects. Transparent basis
P. PIT

HVD is the next generation of optical storage media after Blu ray disk and HD-DVD. Two lasers are used, red and bluish green, which are overlaid and a certain place on the data medium to light up. The bluish green laser reads as laser interference - sample coded data of a holografischen layer within the upper range of the storage medium, while the red laser is used to read auxiliary information from a usual CD-well-behaved aluminum layer in the lower range. The auxiliary information serves to determine where one straight of the disk reads, comparably with sector, head and segment information with a normal non removable disk. With CD or DVD this auxiliary information between the data is scattered. A dichroitische mirror layer between the holografischen data and the auxiliary data reflects the bluish green laser and lets through the red laser. Thus the interference is prevented by refraction of the bluish green laser by the auxiliary data of pit. This is a progress opposite holografischen storage media, which had either too much interference, or over no auxiliary data it ordered whereby they were incompatible with current CD and DVD technology [1].

HVDs have a capacity of up to 1 Terabyte, which corresponds about to twentyfold one Blu ray disk, and a transfer rate of 1 Gbit/s.

The HVD is developed by the Japanese company Optware as well as Fuji photo and CMC Magnetics. These three companies formed together with Nippon Paint, Pulstec Industrial and Toagosei one „for HVD alliance “, in order to advance HVD standard [2].

background

this storage medium momentarily still is in development, therefore there is so far few information in addition.

The specifications for the HVD disk became to 9. Decembers 2004 by the TC44 Committee of the Ecma international decided. At the 3. The following six enterprises „the HVD Alliance created February 2005 “, in order to accelerate the development and to develop the market for the HVD:

  • CMC Magnetics corporation
  • FUJI PHOTO FILM of cost. Ltd.
  • Nippon Paint of cost. Ltd.
  • Optware corporation
  • Pulstec Industrial of cost. Ltd.
  • TOAGOSEI COST. Ltd.

technology

„the Collinear Technology “procedures mentioned for this used, stores the data as it were in the depth of the medium. At first the disks are to be able to store 200 GB. Later are up to 1 Terabyte and/or. 3.9 Terabyte storage capacity possible its.

Web on the left of

Commons: HVD - Pictures, videos and/or audio files


 

  > German to English > de.wikipedia.org (Machine translated into English)