Appeal No. 2000-1252
Application No. 08/522,839
Turning first to the broadest claim on appeal (i.e.,
claim 5), we find that Andrews discloses a disk drive having a
disk
301 and an actuator adjacent the disk (Figure 3). The disk
has a plurality of nominally concentric tracks, and the disk
drive provides a SPE signal 399 to microcontroller 310 that is
indicative of the position of the actuator relative to a
selected track (Figure 4). The disk drive further provides a
correction signal 421 to adjust the relative position of the
actuator with respect to a selected track to thereby reduce
the RRO signals in the SPE signal. In the secondary servo
compensator 400 (Figures 4 and 5), a measurement estimate is
provided by sampling data from the SPE signal 399 with runout
analyzer 510 and runout compensation generator 520, and
accumulating data from the SPE signal in memory 450 over a
first complete disk revolution. The measurement estimate
characterizes RRO signals in the SPE. The correction estimate
from gain adjustment 530 is a correction estimate for the RRO
signals in the SPE signal. Andrews continuously updates the
correction estimate with a measurement estimate to produce the
correction estimate “sector by sector” on each track (column
6
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Last modified: November 3, 2007