Patent ID: 7663833
Filing Date: 2010-02-16
Classification: G11B

Abstract:
1. A controller for controlling movement of a head mounted in a storage apparatus based on a signal output from an acceleration sensor, comprising: a head movement control section which controls movement of the head to a target position on a storage medium; a head unload control section which unloads the head to an unload position based on (1) time starting from a time point at which an initial drop or impact is first detected based on a signal output from the acceleration sensor, and (2) threshold information, which includes a first threshold representing a strength of the signal output from the acceleration sensor at the time of drop and a second threshold representing strength of the signal output from the acceleration sensor at the time of receiving initial impact, wherein the head unload control section includes: a threshold adjusting section which, when the determining section determines that the strength of the signal is not less than the second threshold for not less than the predetermined period, adds a predetermined value to the second threshold, and when the head unload section unloads the head, subtracts a predetermined value from the second threshold.