Patent ID: 6865048

Claim:
An operating method for a disk drive coupled to a higher rank device, the disk drive having a disk-shaped memory medium, a motor rotatably supporting the medium, a motor driving circuit to drive the motor, a read or write head, a head driving mechanism to drive the head, a head driving circuit coupled to the head driving mechanism, and a microprocessor coupled to both the head driving circuit and the motor driving circuit, comprising: switching on a power source of the disk drive; establishing a last seek mode before switching on; and selecting one of a plurality of seek modes according to a command from the higher rank device, wherein if a first seek mode is selected, then the head driving circuit supplies a first drive current to the head driving mechanism, if a second seek mode is selected, then the head driving circuit supplies a second drive current to the head driving mechanism; and wherein a noise level of the disk drive when the first seek mode is selected is greater than a noise level of the disk drive when the second seek mode is selected.