A data recording apparatus that writes data on/reads data from a hard disk drive in response to a data-write/read command received from an upper control device is provided. The data recording apparatus includes a command-aggregating device and a command-issuing device. The command-aggregating device is configured to generate an aggregate command by aggregating contents of a plurality of commands under the conditions that the plurality of commands are of the same kind continuously received from the control device and logical block addresses designated by the plurality of commands are consecutive addresses. The command-issuing device is configured to issue the aggregate command generated by aggregating the plurality of commands to a hard disk drive controller that controls the hard disk drive.