| 摘要 |
PROBLEM TO BE SOLVED: To reduce occurrence of write-fault in a retry method of a magnetic disk device performing retry of write-in of data when following control for a position in which data are written is suddenly disordered by increasing of a resonance component of a mechanism system and the like and write-fault is caused at the time of writing data in a magnetic disk by a head. SOLUTION: As gain margin can be increased by a high frequency having a resonance component of a following control circuit by reducing loop gain of an open loop characteristic of a following control circuit 10 and performing retry after occurrence of an error, gain margin of an open loop characteristic of the following control circuit 10 can be increased, and oscillation in a high frequency caused by increasing of a resonance component due to variation of a characteristic of a mechanism system 9 can be prevented.
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