Patent ID: 7933086

Claim:
A power supply voltage supply circuit comprising: a data processing unit writing data onto a disk medium and/or reading data from the disk medium having a plurality of zones assigned a cylinder number; a data input-output unit transmitting data to the data processing unit at a transfer rate in accordance with the zones; a power supply voltage supply unit supplying a voltage to the data input-output unit; and a control unit controlling the power supply voltage supply unit in order to supply the voltage in accordance with the transfer rate, wherein the control unit determines the voltage that is supplied to the data input-output unit by the power supply voltage supply unit using a table providing an association between the zone formed on the disk medium on which the data are written or from which the data are read by the data processing unit and the voltage value in accordance with the transfer rate corresponding to each zone, and the control unit comprises a plurality of table types, and selects one table to use from among the plurality of table types according to a temperature of the data input-output unit.