Appeal No. 2000-1252
Application No. 08/522,839
drive, a measurement estimate of the RRO is obtained via
sampling and accumulating of data from the SPE signal. The
measurement estimate provides a characterization of the RRO in
the SPE signal. A correction estimate for the SPE signal is
updated by the measurement estimate, and the correction
estimate is added to the SPE signal to produce an adjusted SPE
signal. The disk drive uses the adjusted SPE signal to
generate a correction signal that is used to adjust the
position of an actuator in the disk drive.
Claim 5 is illustrative of the claimed invention, and it
reads as follows:
5. In a disc drive having a disc and an actuator
adjacent the disc, the disc having a plurality of
nominally concentric tracks, the disc drive providing a
servo position error signal indicative of the position of
the actuator relative to a selected track, the disc drive
further providing a correction signal to adjust the
relative position of the actuator with respect to the
selected track, a method for reducing repeatable runout
signals in the servo position error signal comprising the
steps of:
sampling and accumulating data from the servo
position error signal over a first complete disc
revolution to provide a measurement estimate,
the measurement estimate characterizing a
repeatable runout signal in the servo position
error signal;
providing a correction estimate;
2
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007