Patent ID: 7239468

Claim:
A disk drive that includes a spindle motor which drives a disk so that the disk will rotate and a voice coil motor which drives a head so that the head will reciprocate between a position inside the disk and a position outside it, and that uses the head to write data at any position on the disk or read data written at any position, the disk drive comprising: a first initial-condition determination means for, after the power supply of the disk drive is turned on, determining only the first initial conditions for the disk drive which are needed to receive a command from outside and execute the command; a command reception enabling means for bringing the disk drive to a state, in which the disk drive can receive the command, without starting the spindle motor; and a second initial-condition determination means for, after the disk drive is brought to the state in which it can receive the command, starting the spindle motor and determining the second initial conditions including all initial conditions other than the first initial conditions.