The present invention relates to a motor power controller for a disk drive. Furthermore, the present invention relates to a method for controlling the motor power of a disk drive and a disk drive having a motor power controller. Portable audio / video system, or other portable devices such as portable computers or DVD player, such as a laptop computer, typically operate on battery power. Important factor to determine the battery life is a disk drive. In order to maximize battery life, there is a need to improve the efficiency of disk drives. The present invention is, first a disk drive, in particular, a motor power controller for a disk drive embodiment device, the at least two operating states of the disk drives, i.e., to operate continuously for a disk drive motor It has a first operating state, a means for defining a second operation state spinning down the motor the Tha at the beginning of each data operation at the end of the spin-up basil, provide a motor power controller for a disk drive to. Its motor power controller, when the long time interval is determined from the predetermined time period without any data requests comprises means for shifting the disk drive in the second operating state from the first operating state. Further, the motor power controller, a predetermined number of time intervals between successive data requests, when all of them or each is determined to be shorter than the predetermined period, said from said second operation state the first having means for shifting the disk drive to the operating state.