Magnetic disk having an index area and a limited number of radia

Details Magnetic disk having an index area and a limited number of radia Magnetic disk having an index area and a limited number of radia

1988-10-18

1990-01-23

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360 7707, 360 7708, G11B 582

Patent

active

048962406

ABSTRACT:
A magnetic disk, which is used for recording and reproducing data with a read/write head. The magnetic disk has an index area with an index signal recorded therein and a plurality of servo sectors formed between a plurality of data areas subsequent to the index area. Each servo sector has a servo information area, in which a servo information pattern adapted for positioning the read/write head is formed, and first and second gap sections provided on the both sides of the servo information area for absorbing rotational variations of the disk.

REFERENCES:
patent: 4016603 (1977-04-01), Ottesen
patent: 4149199 (1979-04-01), Chick et al.
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4424543 (1984-01-01), Lewis et al.
patent: 4439800 (1984-03-01), Powell
patent: 4516162 (1985-05-01), West
patent: 4530019 (1985-07-01), Penniman
patent: 4578722 (1986-03-01), Lovgren et al.
patent: 4590526 (1986-05-01), Laatt et al.
patent: 4636885 (1987-01-01), Yamada et al.
IBM TDB, vol. 18, No. 8, "Null Servo Pattern", A. J. Betts, Jan. 1976, pp. 2656-2657.
IBM TDB, vol. 23, No. 2, Jul. 1980, "Track-Locating and -Following Apparatus for a . . . ", R. C. Jahnke, pp. 738-742.

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