Self-calibration for computer disk read/write offsets

Details Self-calibration for computer disk read/write offsets Self-calibration for computer disk read/write offsets

1993-12-16

1996-03-19

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 76, 360 7708, G11B 5596

Patent

active

055007767

ABSTRACT:
For disk drives having dual element heads, an invention for providing self-calibration of hard-disk writer elements to reader elements offsets. A method is provided for positioning a reader element for reading information on a disk, and from the information read, determining a reference line for the writer element. The method may be incorporated into a hard-disk in the form of a self-calibration routine in memory. The self-calibration routine may be used for computing offsets for separate writer/reader elements in a dual head assembly. Also, apparatus are provided for self-calibration of hard-disk writer to reader element offsets.

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McEfee, "Read/Write Servo Magnetic Head" IBM Tech. Disclosure Bulletin, vol. 20, No. 9, Feb. 1978, pp. 3673-3674.
Schwartz, "Compensation for Element-to-Element Misregistration in a Dual Element Head" IBM Tech. Discl. Bulletin, vol. 17, No. 1, Jun. 1974, pp. 217-218.

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