Head positioning control system in magnetic disk device of index

Details Head positioning control system in magnetic disk device of index Head positioning control system in magnetic disk device of index

1985-11-21

1987-01-13

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 555

Patent

active

046368841

ABSTRACT:
In the head positioning control system in the magnetic disk device of the index servo system of the invention, a position signal representing the position of the head on the disk, generated by a position signal generator, is converted by an A/D converter into a digital signal. Based on the digital signal, a CPU determines positioning correction data. The CPU stores positioning correction data in a memory, converts it into an analog signal by a D/A converter, and drives a stepping motor through a distributor and a magnetizing circuit so as to correct the position of the magnetic head. If, when the next seek operation is performed, the seek track number to a target track is less than a predetermined value, the difference between the track determined in a previous seek operation and a current track is less than a predetermined value, and the number of previous seek operations without servo data is less than a predetermined value, the CPU will read out the positioning correction data, used in a seek operation, from the memory and position the head. When the above-mentioned three conditions are not satisfied, the head is positioned using servo data read out from the disk.

REFERENCES:
IBM Technical Disclosure Bulletin, vol. 13, No. 11, Apr. 1971, pp. 3433-3434, Track Following and Seeking System, C. Walton.

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