Head position determination control apparatus of data recording/

Details Head position determination control apparatus of data recording/ Head position determination control apparatus of data recording/

1990-01-30

1993-02-16

Dixon, Joseph L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7705, G11B 5596

Patent

active

051876205

ABSTRACT:
In a composite servo system or a servo system using only a sector servo system, when a head switching mode is set during a read/write operation, a CPU checks whether the cylinder of a target track of a subsequent head after switching is the same as that of a target track of a preceding head. If the target tracks are located on the same cylinder, the CPU compares offset value data of a data surface corresponding to the head before switching with that of the head after switching. If an error, as a comparison result, falls within a predtermined allowable range, a read/write operation by the head after switching is continuously executed. The CPU generates correction data used for positional correction processing for positioning the head at the center of the target position of a hard disk and temporarily stores the correction data in a data memory. The CPU executes positional correction processing on the basis of the correction data stored in the data memory.

REFERENCES:
patent: 4371960 (1983-02-01), Kroiss
patent: 4974109 (1990-11-01), Hoshimi et al.
patent: 4982295 (1991-01-01), Yakuwa et al.
IBM Tech. Disc. Bulletin, vol. 17, No. 6, Nov. 1974 "Correction of Data Track Misregistration in Servo Controlled . . . ", A. Paton, pp. 1781-1783.
Commander, et al., "Servo Design for an Eight-Inch Disk File," IBM Disk Storage Technology, pp. 89-97 (Feb. 1980).

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