Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Reexamination Certificate
2007-06-19
2008-12-16
Olson, Jason C (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
C360S061000, C360S078080, C360S078140
Reexamination Certificate
active
07466506
ABSTRACT:
A magnetic recording disk drive has disks with identical pre-patterned servo patterns on their front and back surfaces and a servo control system for positioning the read/write heads using the servo signals from the identical servo patterns. The servo sectors on the two disk surfaces form identical patterns of angularly spaced arcuate-shaped lines that extend generally radially across the data tracks. The arcuate-shaped lines on one surface, the front surface, generally replicate the path of the recording head as it is moved across the data tracks by a rotary actuator, so that there is a constant sampling rate of the servo sectors on the front surface regardless of radial position of the head. However, the arcuate-shaped lines on the other surface, the back surface, do not replicate the path of the recording head so the servo sampling rate is not constant but varies with radial position of the head. The disk drive servo control system implements a method to enable track seeking from one data track to another data track, regardless of whether the initial disk surface and the destination disk surface are front or back surfaces.
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Albrecht Thomas R.
Bandic Zvonimir Z.
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
Olson Jason C
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