Holographic Versatile Disc

[mfblume]

Holographic Versatile Disc
From Wikipedia, the free encyclopedia
Holographic Versatile Disc


Picture of an HVD by Optware
Media type Ultra-high density optical disc
Encoding MPEG-2, MPEG-4 AVC (H.264), NGVC (H.265) and VC-1
Capacity 1 to 10TB,
Developed by HSD Forum
Usage Data storage,
High-definition video, Quad HD & the possibility of Ultra High Definition Video

The Holographic Versatile Disc (HVD) is an optical disc technology. It can hold many times the amount of information as a Blu-ray disc. It employs a technique known as collinear holography, whereby two green laser beams 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 Blue 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 Blue red lasers 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 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 plans one for early 2020 with a capacity of 500 GB and transfer rate of 20 MB/s[2]—although HVD standards were approved and published on June 28, 2007, no company has released an HVD as of March of 2010.

[RandyWayne]

I tell ya, all that storage means that SOON we will be able to keep the name of every single person on Earth in a giant database! It is the precursor to the Mark of the Beast!

Actually, my little Toshiba laptop can do that now.

[RandyWayne]

Actually, there have been several companies working on holographic storage the past decade and just like the super-efficient photovoltaic cell, there always seems to be something just around the corner. I DO hope it materializes though -and for less then 10 grand.

[Praxeas]

Originally Posted by RandyWayne

I tell ya, all that storage means that SOON we will be able to keep the name of every single person on Earth in a giant database! It is the precursor to the Mark of the Beast!

Actually, my little Toshiba laptop can do that now.

Who needs a hard drive? If the seek time is fast, that would be cool. Instead of replacing the entire hard drive and having to reinstall when something goes bad, I just replace the disc drive and replace one of my many cloned copies :-)

I can have a disk for different set ups. Have one purely for gaming, completely stripped down to free up resources etc etc

[RandyWayne]

Originally Posted by Praxeas

Who needs a hard drive? If the seek time is fast, that would be cool. Instead of replacing the entire hard drive and having to reinstall when something goes bad, I just replace the disc drive and replace one of my many cloned copies :-)

I can have a disk for different set ups. Have one purely for gaming, completely stripped down to free up resources etc etc

I would keep a close eye on the research currently going into the memresistor. It is the 4th electronic circuit after the resistor, capacitor, and inductor. THIS will allow a true, "turn on and run!" computer OS.