Dual sector servo system for disk file with separate read and wr

Details Dual sector servo system for disk file with separate read and wr Dual sector servo system for disk file with separate read and wr

1989-11-13

1991-12-17

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7701, 360 7711, G11B 5596

Patent

active

050738330

ABSTRACT:
A method and servo system is provided to compensate for misalignment of separate read and write heads when reading and writing data on a magnetic disk.
Two sets of servo information are generated for each data track on the disk. These sets are radially displaced with respect to each other by a distance equal to the respective misalignments between the read and write heads at each respective data track. One set is generated by the write head. The other set is generated by the write head while the read head is positioned using said one set as a position reference. Thereafter, to write data on a selected track, the read head is first aligned with said one set of servo information and then data is written on said track with the write head. To read data on a selected track, the read head is aligned to said other set of servo information and then the data is read by said read head.

REFERENCES:
patent: 4396960 (1983-08-01), Matla et al.
patent: 4729048 (1988-03-01), Imakoshi et al.
patent: 4833551 (1989-05-01), Song
IBM/TDB vol. 20, No. 9, Feb. 1978 pp. 3673-3674, "Read/Write Servo Magnetic Head" by McEfee.
"Compensation for Elemet-to-Element Misregistration in a Dual Element Head", T. A. Schwartz, vol. 17, No. 1, Jun. 1974, TDB, pp. 217-218.
"Transducer Control for Sector Servo", TDB, vol. 21, No. 5, Oct. 1978, D. W. Brede, p. 2005.

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