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General Hardware Discussion Hard drives, CD, DVD Monitors, All hardware questions not better served by our other Topics


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Old 8th November, 2002, 10:58 AM
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Move over Blu-Ray!

3DCD Pty (An Australian company) has been developing an optical storage system that uses all three dimensions of a CD size disk to store data. Currently their disk stores approximately 20 movies (~120Gb at a guess), by using the volume of the CD, rather than just a layer or two.

They hope to increase the storage capacity up to about 2 Terrabytes, or 2048Gb.

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Old 8th November, 2002, 04:28 PM
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so instead of a single layer or a dual layer it will have many multiple layers? I am a little confused as to how this could be accomplished. (But then again the concept of a grocery store check out scanner was foriegn to me at one time also.) Do you have any links?
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Old 8th November, 2002, 06:35 PM
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Here you go!!! Great site!!
Rob

http://www.howstuffworks.com/cd1.htm
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Old 8th November, 2002, 10:44 PM
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I'm pretty sure that to achieve 120GB of storage, which is about 6 times greater than a double sided dual layer DVD, they're not just adding more layers of single track data. If the drive is indeed a red laser drive and not a blue laser, since I don't believe they are commercially available yet, I would think that they would use some sort of mechanism that stores data in a non-linear stream. There has to be a more efficient method than single track data storage. Since I don't know what that can be, I'll wait until Aidan has more info. Perhaps something that hops layers or something.
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Old 10th November, 2002, 07:08 AM
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i would imagine that it has multiple layers and gets several bits from the optical state and "depth"
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Old 10th November, 2002, 01:58 PM
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There's not much in the way of detail that's linkable at the moment, unfortunately. Most of the information I got was from an Australian newspaper.

However, the system uses a two-photon excitation system, which generally means that the polymer will only change state when hit simultanously with two photons of the correct wavelengths.

This means that there is a write reference beam and a read/write beam. This makes the storage system 3D, and non-linear, so there are no tracks. Consider it to be like a holographic storage using something that looks like a CD rather than a cube of polymer. A CD form factor would be more familiar to users, even if the storage system is completely different.
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Old 10th November, 2002, 02:06 PM
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A link!

Use of polarization sensitivity for three-dimensional optical data storage in polymer dispersed liquid crystals under two-photon illumination.

Yes, it's from the team at Swinburne University, who spun off the 3DCD pty company.

AidanII
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