Data storage drive with reduced power consumption

The data storage drive comprises a storage disk, the read / write head, and the read / write head and the signal processing circuit for signal communication. The read / write head records and reads the data of a plurality of data transmission rate to the recording disk. In addition, the signal processing circuit is supplied power by the variable power source. A variable power source, as a function of the current rate of the data transfer rate of the read / write head, thereby to vary the supply voltage to the signal processing circuit. The power consumption in this manner is reduced.