Patent ID: 7957235
Filing Date: 2011-06-07
Classification: G11B

Abstract:
1. A disk drive comprising: a reading section for reading data from a disk; memory for temporarily retaining data read from the disk; and a control section that controls rotational speed of the disk in accordance with a time interval, the time interval corresponding to a time at which the memory becomes full, the control section controlling the rotational speed of the disk so as to keep the time interval between a set lower limit value and a set upper limit value by first comparing the time interval against the set upper limit value, then either increasing the rotational speed when the time interval is greater than the set upper limit value and when a current rotational speed of the disk is less than an upper rotational speed limit or comparing the time interval against the set lower limit value when the time interval is equal to or smaller than the set upper limit value, and when the time interval is smaller than the set upper time limit value and smaller than the set lower limit value and when a current transfer rate is greater than a lower transfer rate limit, decreasing the rotational speed.