| US 7,602,577 B1 | ||
| Rapid off track detection using in-drive microactuator | ||
| Rickmer Kose, San Francisco, Calif. (US); Erhard Schreck, San Jose, Calif. (US); and Frank Obregon, Ripon, Calif. (US) | ||
| Assigned to Seagate Technology LLC, Scotts Valley, Calif. (US) | ||
| Filed on Jan. 31, 2006, as Appl. No. 11/345,122. | ||
| Claims priority of provisional application 60/649707, filed on Feb. 03, 2005. | ||
| Int. Cl. G11B 27/36 (2006.01); G11B 5/596 (2006.01) | ||
| U.S. Cl. 360—77.03 [360/31] | 21 Claims |
| 1. A disk drive detection system for detecting rapid off track events occurring in a disk drive, said system comprising:
an actuator assembly including a microactuator, said actuator assembly being movable with respect to a disk of the disk drive
for writing data to and reading data from respective tracks on the disk, said microactuator including at least one piezoelectric
element producing a voltage signal in response to a rapid off track event;
a detection circuit for detecting an off track event, said detection circuit analyzing the voltage signal produced from said
piezoelectric element and comprising:
(i) a demodulator for processing the voltage signal produced by said piezoelectric element, (ii) a high frequency band pass
filter, (iii) a low frequency band pass filter, said filters for isolating signal frequencies indicative of a rapid off track
event, and (iv) at least one threshold detector for comparing said signal frequencies to a threshold for determining whether
a rapid off track event has occurred; and
means for remediating an error condition caused by the rapid off track event, said means for remediating including at least
one of a software or firmware application incorporated in said disk drive wherein a drive mode of said disk drive is analyzed
for read/write errors caused by said rapid off track event.
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