Method and apparatus for writing pattern on disk

Details Method and apparatus for writing pattern on disk Method and apparatus for writing pattern on disk

2007-04-19

2009-08-11

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077080

Reexamination Certificate

active

07573669

ABSTRACT:
Embodiments in accordance with the present invention ensure that the pitch of a servo write track is accurately controlled. According to one embodiment of the present invention, a Self Servo Write (SSW) uses different methods and sequences to identify read-write offsets (RWOs) and calculate target positions in inner and outer diameter sides of a magnetic disk. In the inner diameter-side area, the SSW controller uses the readout of a radial pattern written on a recording surface and a reference value to identify the RWO. The SSW controller uses the RWO value identified in the inner diameter-side area to anticipate an RWO value in the outer diameter-side area. In the outer diameter-side area, the SSW controller uses the anticipated RWO value to determine the target position of each servo write track.

REFERENCES:
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patent: 2003-338147 (2003-11-01), None
patent: 2004-303325 (2004-10-01), None

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