Information storage medium, method of fabricating same, and drive unit for such medium
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United States of America Patent
Stats
-
Sep 12, 1995
Grant Date -
N/A
app pub date -
Aug 12, 1993
filing date -
Oct 9, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An information storage medium having both a read-only optical storage portion and a magnetic storage portion that can be written and read is provided. There is also disclosed a drive unit for use with this information storage medium. To control the optical head of this drive unit, a system controller and a CLV servomechanism are provided and form a control portion. When information is written or read to or from the magnetic storage portion, this control portion commands a disk-rotating mechanism to control the magnetic head of the drive unit based on information read from the optical storage portion of the medium. The magnetic storage portion can have either a single track or plural tracks. Interference between the optical head and the magnetic head can be avoided. The drive unit can adapt itself to the information storage medium having the optical storage portion of a large storage capacity and the magnetic storage portion that can be easily rewritten.
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