Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1986-11-26
1989-11-07
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7809, 360 7814, G11B 2108, G11B 2110
Patent
active
048796123
ABSTRACT:
A velocity servo system for a disk drive, the servo system being responsive to digital signals and generating a control signal for moving a read head of the disk drive from a current track position to a commanded track position. The servo system includes a circuit for reading current track address information and servo bursts recorded on a disk in said disk drive and for generating threshold signals when said read servo bursts are of a predetermined amplitude. An appropriately programmed data processing system provides a decoder responsive to the current track address read by the reading means and to the threshold signals for generating a current half track address, a first comparator which compares the current half track address with the commanded track position to generate half tracks-to-go digital data in response thereto; and generates commanded acceleration data in response to the half tracks-to-go data and to successive half track addresses. The servo system further includes a digital to analog converter for converting said commanded acceleration data to said control signal.
REFERENCES:
patent: 4462053 (1984-07-01), Lum et al.
patent: 4488189 (1984-12-01), Axmear et al.
patent: 4679103 (1987-07-01), Workman
IEEE Transactions or Magnetics, vol. Mag--17, No. 4, Jul. 1981, C. Maury, High Track Denisty for Magnetic Disk Drives with an "Embedded Servo" Positioning System, p. 1396.
Freeze Robin J.
Grimsley John L.
Data Technology Corporation
Faber Alan
Robertson David L.
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