Method and system for positioning head on target cylinder of dis

Details Method and system for positioning head on target cylinder of dis Method and system for positioning head on target cylinder of dis

1991-09-27

1994-05-10

Callahan, Timothy P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7705, 360 7708, G11B 5596

Patent

active

053113799

ABSTRACT:
A method of positioning a magnetic head on a target cylinder of a magnetic disk uses a position signal derived from a servo signal which is read from a magnetic disk using a magnetic head. The servo signal includes at least first and second servo signal components on even cylinders of the magnetic disk and includes at least third and fourth servo signal components on odd cylinders of the magnetic disk. The position signal is used for moving the magnetic head to a desired cylinder. The method comprises the steps of obtaining a first position signal for positioning the magnetic head to an odd cylinder on the magnetic disk based on a difference between peak values of the first and second servo signal components, obtaining a second position signal for positioning the magnetic head to an even cylinder on the magnetic disk based on a difference between peak values of the third and fourth servo signal components, and using only one of the first and second position signals to position the magnetic head to the target cylinder depending on a cylinder address of the target cylinder.

REFERENCES:
patent: 4499511 (1985-02-01), Sugaya
patent: 4539607 (1985-09-01), Fujiki
patent: 4638384 (1987-01-01), Stewart et al.
patent: 5079654 (1992-01-01), Uno et al.
Patent Abstracts of Japan, vol. 6, No. 8 (P-98) Jan. 19, 1982 & JP-A-56 134362 (Toshiba Corp.) Oct. 21, 1981.
Patent Abstracts of Japan, vol. 6, No. 248 (P-160) Dec. 7, 1982 & JP-A-57 143770 (Hitachi Corp.) Aug. 6, 1982.
Patent Abstracts of Japan, vol. 11, No. 173 (P-582) Jun. 4, 1987 & JP-A-62 003473 (Toshiba Corp.) Jan. 9, 1987.
Patent Abstracts of Japan, vol. 15, No. 5 (P-1149) Jan. 8, 1991 & JP-A-2 253425 (NEC Corp.) Oct. 12, 1990.

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