Head positioning servo for disk drive

Details Head positioning servo for disk drive Head positioning servo for disk drive

G - Physics

11

B

352/24.3

G11B 21/10 (2006.01) G11B 5/596 (2006.01) G11B 17/02 (2006.01)

Patent

CA 1174357

IOM-8112 Abstract of the Disclosure An improved servo encoding scheme and demodulation circuit for control of the position of a read/write head with respect to a magnetic recording disk is disclosed. First and second signals of like polarity are recorded preceding each data field on the sector of the disk. The signals are summed to provide automatic gain control to the servo loop to compensate for variations in read-back amplitude, while the difference between the two signals is measured and used to provide an indication of departure of the head from the center of the disk track.

401653

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