Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1987-06-19
1989-05-16
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7704, 360 7708, G11B 555, G11B 5596
Patent
active
048314714
ABSTRACT:
A head positioning system capable of positioning a magnetic head at the center line of a target track of a floppy disk at high speed, in which a positioning controller prepositions the magnetic head within a predetermined distance from the center line of the target track based on a position error signal indicating the deviation of the magnetic head from the center line of the target track. A positioning compensation controller generates a compensation signal whose frequency is twice the disk rotational frequency so that the positioning compensation controller positions the magnetic head at the center line of the target track. A switching compensation controller connected to the positioning compensation controller enables the compensation signal to equal the output of the initial positioning controller during the prepositioning operation.
REFERENCES:
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4286318 (1981-08-01), Immink et al.
IBM TDB, vol. 21, No. 7, "Disk Runout Accommodation", Mantey, 12/78, pp. 2688-2691.
Faber Alan
Garland Steven R.
NEC Corporation
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