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- THE WEEK, Page 18HEALTH & SCIENCEIt's . . . Superdisk
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- A new technology could store War and Peace on a pinhead -- twice
- over
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- Computer researchers are always vying to cram just a little
- more information into a slightly smaller space. But a new
- technology just announced by scientists at AT&T Bell
- Laboratories may force the competition into playing catch-up for
- a long time to come. They have found a way to squeeze up to 45
- billion bits of data onto a square inch of disk space -- 300
- times as much as an ordinary disk, and 100 times as much as the
- most advanced magneto-optical technology. The system could put
- two copies of War and Peace on the head of a pin.
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- More important, it could provide a way to store moving
- pictures, which require large amounts of data, on conventional
- compact discs, to be played back by computers or on television
- sets. A palm-size disk could hold 17 hours of programming. It
- works like other magneto-optical disks: a laser heats and
- magnetizes the disk surface, then another laser reads the
- magnetized spots. But while current systems use lenses to focus
- the laser, this one funnels the light through an optical fiber
- that has been stretched 1,000 times as thin as a human hair --
- a much tighter focus than a lens can achieve. The main stumbling
- block: the laser that reads these disks is too slow for
- commercial applications, so far.
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