Method and apparatus for rewriting servo information on a disk i

Details Method and apparatus for rewriting servo information on a disk i Method and apparatus for rewriting servo information on a disk i

1996-09-13

1999-07-20

Hindi, Nabil

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, G11B 2108

Patent

active

059263369

ABSTRACT:
The present invention is a method and apparatus for rewriting servo information on a disk of a hard disk drive. The new servo pattern is written on the tracks on the heads or sides of a disk pack using the stagger wedge scheme. When the read/write heads reach the first track beyond the inner diameter crash stop of the disk pack, the first read/write head is directed to write the new servo information, followed by the writing of data in each sector of the entire track, while the other read/write heads remain deactivated. The data writes over any pre-existing servo information on the track. Next, the second read/write head is directed to write the new servo information, followed by the writing of data in each sector of a complete track while the other read/write heads are deactivated. During the power-on sequence, the read/write heads are directed to the portions of the disk beyond the inner diameter crash stop, where the new servo pattern and the new data have been written, so as to read the new servo pattern.

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