Seagate Technology Incorporated

Maxtor Corporation

Farhad Navid

Richard Edward Martin

Larry G Hutsell

David Finamore

Dave Finamore

Jeff Nelson

Anton Viktorovich Goldade

The present disclosure is directed to spectral analysis of a position error signal. In a particular embodiment, the method includes analyzing a spectral content of a position error signal. The method also includes comparing the spectral content to a threshold. Further, the method includes determining a result based on the comparing the spectral content to the threshold. In another particular embodiment, the spectral content of the position error signal is determined by performing a discrete fourier transform (DFT) on the error signal, determining a magnitude of the DFT output, and low pass filtering the magnitude.

Spectral analysis of a position error signal

A disk drive can include a data storage disk, a head, an acceleration sensor, and a controller. The head is configured to write data on the disk. The acceleration sensor generates an acceleration signal that is indicative of acceleration of the disk drive. The controller determines when the disk drive is being subjected to a vibration condition determination. The controller can inhibit writing of data through the head onto the disk based on comparison of the acceleration signal to the threshold value.

Controlling a write inhibit threshold based on vibration

Disturbances to actuator control caused by external vibrations are corrected using feed-forward techniques that are selectively enabled or disabled based on signal values within a track follow loop. An increase in data integrity and reliability may be achieved by reducing off-track reads and writes caused by physical disturbances to disk drives during operation. Accelerometers detect external forces imparted on a disk and an acceleration feed-forward (AFF) signal is generated to compensate for disturbances to the location of a head caused by such external forces. Application of the AFF signal to an actuator may be based on whether signal values along the track follow loop exceed a certain threshold.

Acceleration feed-forward correction enabled or disabled based on track follow loop signals

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Boulder, CO, United States of America

Farhad Navid