A storage device includes a programmable device into which predetermined control data is written, a control data storing unit that stores therein write control data and read control data, the write control data being control data for realizing a function to save data stored in a cache memory into a nonvolatile memory when an abnormal shut-down occurs and the read control data being control data for realizing a function to restore the data saved in the nonvolatile memory into the cache memory when an electric power source is turned on after the abnormal shut-down, a writing unit that, when an electric power source is turned on after occurrence of the abnormal shut-down of the storage device, writes the read control data into the programmable device, and a restoring instructing unit that instructs the programmable device to restore the data saved in the nonvolatile memory into the cache memory.