Data storage milestone -
p2pnet.net News:- Japan’s Optware Corp says it’s successfully integrated optical disc technology with holographic recording technology, resulting in the world’s first movie recording on a preformatted holographic disc.
Claiming it as a major milestone for commercializing holographic data storage, Optware says recording holographic page data on a rotating transparent disc has been reported before but, lacking servo information, the discs “do not seem to have a commercial viability”.
Optware says it’s overcome the problem by applying a dichroic mirror layer between the recording and reflective layers.
“This dichroic mirror layer blocks the diffusion by the address pits, allowing ideal collinear holographic recording,” it says.
Data storage pioneer Michael Thomas has been tracking Optware, along with other companies working in the same area.
For the technically inclined, he told p2pnet that Aprilis and Lucent’s Insight were first firms to produce holographic storage successfully, even though it was WORM – write once, read many times.
“Optware, Aprilis, Lucent, Siros Technology and others have been trying for years to develop a 3D storage near field recording concept using Poloroid CROP Photopolymer (epoxy-modified silicones, basically the same formula for floppy diskettes with magnetic oxides left out) named ‘Aprilis HMD120′ holographic media, which is useful for WORM holographic storage,” he says
“Photopolymers are light and heat sensitive, exhibiting out-gasing problems during curing. This means they have to be stored with extreme care. Repeated disk media exposure over Time to Light causes CROP photopolymer increased modulation and reliability problems which affect reading.
“CROP polymers must be read at 1550 nm ( GREEN Laser ), well above the 1 nm to ~ 400 nm range of UV Laser Photons used by Colossal Storage REWRITABLE Atomic Holographic Storage.
“CROPS photopolymer like all plastic based polymers have cross linking problems when exposed to UV and basically self destruct. Data lifetime is expected to be good but no lifetime numbers have been defined.”
August 27th, 2004 at 9:15 am
“CROP polymers must be read at 1550 nm ( GREEN Laser ), well above the 1 nm to ~ 400 nm range of UV Laser Photons”
green laser –>1550 nm?????…..
August 27th, 2004 at 7:01 pm
“oops …” Michael tells me. “That should be 500 nm, not 1550 nm”.
Cheers!