US PATENT SUBCLASS 369 / 280
.~ Specific disc profile

Current as of: June, 1999
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369 /   HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL

272  DF  STORAGE MEDIUM STRUCTURE {11}
280.~ Specific disc profile {1}
281  DF  .~.~> With interdisc coupling

DEFINITION

Classification: 369/280

Specific disc profile:

(under subclass 272) Subject matter including a disc, the thickness of which varies as a function of the radius.

(1) Note. A typical profile will have ridges at the circumference to space the modulated grooves from one disc to another to avoid scratching.