Data storage device and power-saving control method for data storage device

A power-saving control method for a data storage device that includes a first nonvolatile memory, a second volatile memory that temporarily stores therein data to be transferred between a host device and the first memory, a first control unit that controls the second memory, a second control unit that controls data transfer between the first control unit and the first memory, and a third control unit that controls data transfer between the host device and the first control unit,

• the power-saving control method comprising stopping a clock signal supplied to the first to third control units in conjunction with a power consumption control of the third control unit to perform a power saving control.