Abstract: In a controller of a tape drive, when a command processor receives a command for moving to the end of data (“EOD”) or the like, an operation signal output unit suspends the moving of a tape and a cartridge memory (“CM”) input/output unit stores therein a state of the tape in which the moving has been omitted. Then, when the command processor receives a command for writing data in this state, the CM input/output unit writes the data to a cartridge memory. Subsequently, for example, when a head passes a proper position at which the data should be actually written to the tape, the CM input/output unit reads the data from the cartridge memory, and the channel input/output unit writes the data to the tape at the proper position.

Abstract: An optical disc playback device is capable of being transitioned to a sleep mode in consideration of an optical disc status or an optical disc drive device status. An optical disc playback apparatus includes a main controller to transmit a sleep mode transition command to an optical disc drive device, and an optical disc drive device controller to check either a status of an optical disc or a status of the optical disc drive device when the sleep mode transition command is transmitted to the optical disc drive device, and to determine whether to perform transition to the sleep mode in response to the optical disc status or the optical disc drive device status.