Method for preventing reduction in a reproduced output of a...

Details Method for preventing reduction in a reproduced output of a... Method for preventing reduction in a reproduced output of a...

2007-04-24

2007-04-24

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S051000

Reexamination Certificate

active

11135510

ABSTRACT:
Servo regions are re-magnetized in the present invention. A magnetic storage device measures a first amount which is indicative of the magnitude of magnetization of a servo region, by a read head portion. The first amount may be a reproduced output, or an inverse of a gain used in an automatic gain control, etc. Servo regions are re-magnetized by a write head portion, when a servo region is detected in which a ratio of the measured first amount to an initial value of the first amount is smaller than a predetermined value, i.e., it is determined that the magnetization is reduced.

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“Structure and Application of Hard Disk Devices,” p. 72 (May 1, 2002).

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