Recording method, unload method, and magnetic disk

Details Recording method, unload method, and magnetic disk Recording method, unload method, and magnetic disk

2007-07-27

2009-12-22

Tzeng, Fred (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

Reexamination Certificate

active

07636218

ABSTRACT:
Embodiments of the present invention prevent occurrence of a write pole erasure in the event of a power failure within a magnetic disk apparatus of a perpendicular magnetic recording system. According to one embodiment of the present invention, a recording current is flowed through a magnetic head to record data in a magnetic disk. An occurrence of a power failure in the magnetic disk apparatus is detected. When a power failure has occurred, the recording head is demagnetized with power in case of a power failure. The recording head is unloaded after the recording head has been demagnetized. For the power in case of a power failure, back electromotive force of a spindle motor can be utilized. As a result, effects exerted on data recorded in the magnetic disk due to residual magnetism remaining in the recording head can be eliminated.

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