Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1995-06-02
1996-07-09
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7704, 360135, G11B 5596, G11B 582
Patent
active
055350690
ABSTRACT:
A diskette comprising a jacket, a liner material disposed within said jacket, a flat circular media having a magnetic coating on both sides disposed within said liner material, a hub attached at the center of said media, a plurality of servo grooves on at least one of said sides of said media that have stitched patterns that will alternate on-and-off at twenty kilohertz in the presence of a constant, unmodulated light source. The diskette is magnetically formatted with reference and data tracks recorded in such a way that extremely accurate position determinations can be made by looking at the analog amplitude of the detected tracks and comparing them at different head positions. The innermost tracks contain redundant copies of a disk mapping table that comprises data for a media type code, a sector size code, a sector interleave code, a total track count, a reassignment area starting address, a data area starting address, a total sector count, an update count, and a reassignment table having at least room for 250 entries of three bytes each.
REFERENCES:
patent: 3034111 (1962-05-01), Hoagland et al.
patent: 4791622 (1988-12-01), Clay et al.
patent: 4961123 (1990-10-01), Williams et al.
patent: 5111444 (1992-05-01), Fukushima et al.
Chiao James
Godwin Jimmy D.
Otis, Jr. Alton B.
Rose Andrew M.
Strysko Mark E.
Insite Peripherals, Inc.
Psitos Aristotelis
Schatzel Thomas E.
Wilson James T.
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