Disk drive calibrating threshold and gain of touchdown sensor
First Claim
Patent Images
1. A disk drive comprising:
- a disk comprising a plurality of tracks;
a head actuated over the disk, the head comprising a touchdown element operable to generate a touchdown signal; and
control circuitry operable to;
amplify the touchdown signal by a gain to generate an amplified touchdown signal;
detect a touchdown event by comparing the amplified touchdown signal to a threshold;
during a calibration operation, adjust the gain and adjust the threshold until the amplified touchdown signal does not exceed the threshold; and
during a normal operation, detect the touchdown event based at least partly on the adjusted gain and the adjusted threshold.
8 Assignments
0 Petitions
Accused Products
Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks. The head comprises a touchdown element operable to generate a touchdown signal. The touchdown signal is amplified by a gain to generate an amplified touchdown signal, and a touchdown event is detected by comparing the amplified touchdown signal to a threshold. During a calibration operation, the gain is adjusted and the threshold is adjusted until the amplified touchdown signal does not exceed the threshold. During a normal operation, the touchdown event is detected based at least partly on the adjusted gain and the adjusted threshold.
-
Citations
20 Claims
-
1. A disk drive comprising:
-
a disk comprising a plurality of tracks; a head actuated over the disk, the head comprising a touchdown element operable to generate a touchdown signal; and control circuitry operable to; amplify the touchdown signal by a gain to generate an amplified touchdown signal; detect a touchdown event by comparing the amplified touchdown signal to a threshold; during a calibration operation, adjust the gain and adjust the threshold until the amplified touchdown signal does not exceed the threshold; and during a normal operation, detect the touchdown event based at least partly on the adjusted gain and the adjusted threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of operating a disk drive comprising a head actuated over a disk comprising a plurality of tracks, the head comprising a touchdown element operable to generate a touchdown signal, the method comprising:
-
amplifying the touchdown signal by a gain to generate an amplified touchdown signal; detecting a touchdown event by comparing the amplified touchdown signal to a threshold; during a calibration operation, adjusting the gain and adjusting the threshold until the amplified touchdown signal does not exceed the threshold; and during a normal operation, detecting the touchdown event based at least partly on the adjusted gain and the adjusted threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification