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Toshiba presents: 36GB dual-layer rewritable disc

Written by Jari Ketola @ 10 May 2003 10:27 User comments (13)

Toshiba will be preseting its developments in the research of a dual-layer, 36GB Advanced Optical Disk (AOD) rewritable medium at Optical Data Storage meeting in Vancouver, Canada this weekend. Dual-layer AOD tightens the competition between AOD and rival blue-laser technology -- Blu-Ray. Dual-sided Blu-Ray discs offer a maximum capacity of 50GB. Last month Sony announced the first Blu-Ray recorder for consumer markets with a 23GB storage capacity.
The AOD technology developed by NEC and Toshiba was chosen by DVD Forum as the next-generation DVD-format. It is physically compatible with current DVD format, which makes the development of AOD hardware easy, and lowers the costs.

EE Times

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13 user comments

110.5.2003 11:06

Will these discs be able to be written on by regular DVD writers? If so then we can put four DVD-9's on one AOD! How awesome would that be... Euro

210.5.2003 12:03

No way, Euro. NO WAY. They are vastly different formats.

310.5.2003 12:17

But it says that it's physically compatible with current DVD format. Do you mean that regular DVD writers are not able to write to them but that these discs are playable in regular DVD players? Euro

410.5.2003 14:23

instead of getting peoples guesses on items like this. lets just wait and see. we will not know the answer till its released

511.5.2003 0:05

The EE Times announcement doesn't give enough information. "Compatible with current DVD format" is a phrase you should take with a grain of salt. You may be able to play a present-day DVD on this system, but there's _no way_ a present day DVD burner is going to burn a dual-layered <A>dvanced <O>ptical <D>isc !!!

611.5.2003 0:31

The compatible means downwards compatible -- i.e. discs are same size and AOD players (just like Blu-Ray players/recorders) can _play_ DVD-Video discs. Just like DVD players can play CDs, but your CD player can't play DVDs.

Petteri Pyyny (pyyny@twitter)

711.5.2003 0:38

Great Googly-Moogly! It's 5:34 AM Nova Scotia time, and you caught my post. (I gues great minds never get much sleep, eh dRD?) :) (I know, I know), It's a dirty job, but someone's gotta do it. Don't forget to occassionally reply to the 'ban-request-thread', even if you don't agree with a particular request. (Thankee). - Mike, the insomniatic Klingon - (actually, I just crawled out of bed).

811.5.2003 6:04

Will these discs be able to be written on by regular DVD writers? If so then we can put four DVD-9's on one AOD! How awesome would that be...
No.. For starters AOD uses 405nm (violet) laser. AOD needs an AOD drive to read/record the discs. I do see how my post can be misleading -- I should have underlined the difference between physical compatibility and logical compatibility. The physical similarities between AOD and DVD are: same lens aperture (0.60-0.65 for DVD, 0.65 for AOD), same protective layer thickness (0.6mm), and the same free working distance (1.0mm). The specs for BluRay are accordingly: 0.85, 0.1mm, and 0.05-0.10mm. AOD discs, like DVDs, are used without a cartridge. BluRay uses a cartridge.
Jari Ketola

911.5.2003 9:24

US Patented UV/Blue Holographic nanoStorage will hold > 4,000 Blu-Ray disks. Holographic Storage technologies will start displacing other optical storage technologies so we can have one format, one drive type, one interface. Keep an eye out as this technology starts to appear in the next few years.

3D Storage NanoTechnology goto,

1011.5.2003 9:37

BluRay uses a cartridge.
What? I hate those things. Why does it need a cartridge?

1111.5.2003 10:40

What? I hate those things. Why does it need a cartridge?
Probably to keep the surface of the disc dust and finger print free. A big, greasy thumbprint is bad news at BluRay data density. I don't have a clue how AOD addresses read errors.
Jari Ketola

1212.5.2003 12:36

AOD likely uses some heavy Forward Error Correction similar to Satellite systems to protect against noise (dirt). It's hard to believe that even the current CD standard uses three levels of forward error correction. Not to sure for DVD's, but AOD would certainly need to use some severe FEC as from what I can see, one spec of dust could potentially cover the area of 1,000's of physically written bits and maybe over 1 million bits for a small fingerprint.

1316.5.2003 6:20

They will initially be in a case, and then be available without I presume. Just like DVD RAM.

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