Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1980-11-12
1983-06-28
Kilgore, Robert M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 77, G11B 2108, G11B 2110
Patent
active
043909124
ABSTRACT:
A transducer positioning system and a magnetic disk therefor for use in a disk drive unit of a data processing system. The magnetic disk contains plural servo sectors interposed between a plurality of circumferentially spaced data sectors. Each servo sector contains at least two sets of spaced servo blocks that include first and second asymmetrical, time-displaced, complementary servo information signals located in radially adjacent blocks. Respective sets of data track centerlines are aligned with the phase boundaries of an associated set of servo blocks in the servo sector. The disk drive unit includes a controller that selects one of the servo blocks and use a null detector to position a movable transducer over a data track centerline associated with the set of phase boundaries of the selected servo block. The controller additionally includes a track difference counter responsive to the null detector thereby to count zero crossings of the phase boundaries during movement of the transducer for indicating the displacement between the movable transducer and the desired data track in the data sector and for controlling the movement of the transducer.
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IBM Tech. Disclosure Bulletin- Servo Positioning of Mag. Head, vol. 13, No. 10, Mar. 1971, p. 3161.
IBM Tech. Disc. Bulletin, vol. 19, No. 7, Dec. 1976, pp. 2686-2687, Measuring and Adjusting Speed of Magnetic Disk Access Arm, p. 2686.
Hertrich Friedrich R.
Perera Slobodan R.
Digital Equipment Corporation
Kilgore Robert M.
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