| 摘要 |
PURPOSE: A method for controlling speed of a disk drive is provided to control results of a transmitted command and an allowable high speed of the disk drive according to a disk format, based on a transmission period of the command, thereby reducing unnecessary high-speed driving of the disk drive. CONSTITUTION: If a request command is received from a host computer(301), a disk drive checks whether a reasonable check mode for a high speed is set(302). Otherwise, the disk drive sets the reasonable check mode for the high speed(303), and detects gaps between a receiving completion time of a previously received command and a receiving start time of the currently received command(304). A controller of the disk drive checks whether the detected gaps are more than a preset time(305). If so, the controller checks whether the same gaps are periodically generated(306). If so, the controller decides that an operation mode of the host computer does not have to be operated at high speed. The controller downward sets the allowable high speed of the disk drive(307), and returns to the first step.
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