Magnetic disk drive with sensing current adjustment of MR head

Details Magnetic disk drive with sensing current adjustment of MR head Magnetic disk drive with sensing current adjustment of MR head

1994-03-07

1998-02-17

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 65, 360 75, 360 46, G11B 503

Patent

active

057197199

ABSTRACT:
A sensing current adjusting zone is formed in the outermost or innermost periphery of a magnetic disk and reference signals are recorded in a recording width corresponding to the width of a plurality of tracks in the sensing current adjusting zone so that the phases of the reference signals are the same and the radially adjacent reference signals overlap each other. When adjusting the sensing current, an MR head is moved forcibly into the sensing current adjusting zone to reproduce the reference signal and the sensing current is adjusted so that the difference between the respective absolute values of the plus peak and the minus peak of the reproduced reference signal is reduced to the least extent. Therefore, in a magnetic disk unit of a servo system or the like provided with an MR head for reproducing servo information, the sensing current to be supplied to the MR head can be adjusted to an optimum current, the sensing current can be correctly adjusted even in a process in which the servo system of the magnetic disk unit is unable to carry out positioning control. A feedback loop for sensing current adjustment is capable of always adjusting the sensing current to an optimum current even if the characteristics of the MR head varies with time.

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