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A disk drive with a second laser on the top facing down to read the other side of a special type of disk.
The disk would be two sided, with the information on the top in the opposite direction of information on the bottom (actually the same direction instead of the opposite direction), since the drive
would be reading the top of the disk in the opposite direction.
With this drive and these disks, you could store more information on a single disk and access information from either side simultaneously, without having to flip the disk over to read the other side.
This would be especially useful movies, or large games.
a CD
http://upload.wikim...CD_autolev_crop.jpg
[BJS, Jul 14 2006]
a DVD-R
http://upload.wikim...D-R_bottom-side.jpg
[BJS, Jul 14 2006]
Holographic-versatile-disk HVD
http://en.wikipedia...phic_Versatile_Disc
[Ling, Jul 14 2006]
[link]
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in that they would take up twice as much
space as normal disks and drives. |
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The drive would take up almost twice as much space, but not quite since it would be a single devive. The disks would be the same size as normal disks. |
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If it used laptop disk drive technology, then it could possibly be small enough to fit in a standard desktop computer disk drive bay. |
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[bjs], the disk would have to be thicker in
order to account for the second layer
necessary on the top for the second layer.
as you mentioned, using laptop size
reducing methods might get this down to
standard 3.5 inch drive size, but this
wouldn't fit in my powerbook. also, you
couldn't write a label on it, so it creates a
market for label printers that can put a
label in the clear inner ring. |
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Sorry, but wouldn't it be cooler if you had to flip it over to play the other side? |
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Glue two disks together and see if it works. |
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Now I might be wrong, but I distinctly remember that the new high density DVD disks will use both sides.
Edit: I checked: I'm wrong. But I found out about Holographic DVDs. Check it out. |
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[tcarson], I don't think that it would "have to be thicker in order to account for the second layer necessary on the top for the second layer.", if you mean it will be slightly thicker just because of the "second layer", then simply make the plastic disk slightly thinner to account for it. There are already label printers that print on the clear inner ring. |
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[jmvw], I don't see how it would be cooler to flip the disk over. |
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[greyfriend], gluing two disks together wouldn't work because the disk has to spin in a certain direction, the top would be spinning in the wrong direction to read. And double sided disks already exist. |
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//it will spin in the wrong direction// - no
it won't, if it's back to back. Discs are old
news anyway and not worth developing
further. |
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Coming soon - "Your entire record
collection on a toothpick" |
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[xenzag] you are incorrect, if you think about it you should be able to figure that out. |
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The idea is valid, but sheesh! Could you be a bit less abrasive about it? You'll damage the disks! |
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From How Stuff Works "How DVDs work"//An interesting thing to note is that if a DVD has a second layer, the start of that layer's data track can be at the outside of the disc instead of the inside. This allows the player to transition quickly from one layer to the next, without a delay in data output, because it doesn't have to move the laser back to the center of the disc to read the next layer.//
Normally the spiral starts at the centre. This means that the second layer spiral direction is opposite. So I think that either direction of spiral is possible. By the way, multi-layer disks reduce the need to read from the other side. |
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Now I'm thinking of the entire British
Library inscribed on grains of sand and
placed in a match box, complete with tiny
tweezers, magnifying glass for loading,
and minuscule optical player for viewing. |
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