Transient temperature compensation for moving head disk drive

Details Transient temperature compensation for moving head disk drive Transient temperature compensation for moving head disk drive

1978-08-01

1980-06-10

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, 360 98, 318634, G11B 556, G11B 2110, G05D 23275

Patent

active

042076013

ABSTRACT:
A transient temperature compensation system for use in a magnetic disk drive comprised of both fixed and removable disks. The system includes first and second thermistors respectively mounted immediately adjacent the fixed and removable disks. The second thermistor is preferably mounted for movement between an operative position and an inoperative position. In the operative position, the thermistor is positioned in very close proximity to the disk. In the inoperative position, the thermistor is spaced from the disk to permit sufficient clearance to enable the disk to be removed from the drive. The outputs of the two thermistors are used to develop a signal representing the temperature differential between the two discs which signal is supplied to the disk drive head positioning system. This signal is used to modify the positioning of the heads relative to the fixed disk to compensate for differences in the radial positions of corresponding tracks on the fixed and removable disks.

REFERENCES:
patent: 3720930 (1973-03-01), Elsin g
patent: 3753254 (1973-08-01), Ruble et al.
patent: 3757189 (1973-09-01), Buchan
patent: 3775655 (1973-11-01), DuVall
patent: 3900782 (1975-08-01), Hammerschmitt
patent: 4056831 (1977-11-01), Godbout et al.
patent: 4121265 (1978-10-01), Derc
patent: 4122503 (1978-10-01), Allan

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