Magnetic disk apparatus and magnetic disk access control method

Details Magnetic disk apparatus and magnetic disk access control method Magnetic disk apparatus and magnetic disk access control method

2009-06-15

2010-12-07

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077020, C360S031000

Reexamination Certificate

active

07848049

ABSTRACT:
A magnetic disk apparatus includes a magnetic disk, a magnetic head, a reverse-pulse detector, and a re-magnetizer. The magnetic disk includes a data recording area and a servo-pattern area. The magnetic regions of the servo-pattern area have been pre-magnetized in the same direction or pre-magnetizing direction. The magnetic head is arranged to reciprocate radially of the magnetic disk. The reverse-pulse detector is provided for reading the servo-pattern area with the magnetic head before data recording or reproducing with respect to the data recording area is performed. The reverse-pulse detector detects, from servo reproduction signal pulses, reverse pulses corresponding to the reversal of magnetization direction relative to the pre-magnetizing direction. The re-magnetizer causes the magnetic head to perform the re-magnetizing of the magnetic regions in the servo-pattern area when the count of reverse pulses is not smaller than a threshold number.

REFERENCES:
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patent: 2010/0128384 (2010-05-01), Shibano
patent: A 2003-157507 (2003-05-01), None
patent: A 2004-110896 (2004-04-01), None
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patent: A 2007-226918 (2007-09-01), None

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