Patent ID: 6785745
Filing Date: 2004-08-31
Classification: G11B

Abstract:
A recording/playback apparatus comprising:a disk device for recording data on a disk type recording medium; and an upper control unit for controlling processes of at least one of input/output of data from/to the outside of said apparatus, reproduction and processing of data, and data processing of at least one of reading and writing of said disk device; wherein: said upper control unit includes a composite command issuance unit which issues, to said disk device, a composite command comprising a real processing command, which is a processing command to be actually executed in said disk device, and a virtual command, which is a processing command that is expected to be issued by said upper control unit to said disk device after said disk device has processed the real processing command; and said disk device comprises a lower control means for receiving the composite command from said upper control unit, and for controlling at least one of writing and reading of digital data, and a recording/playback head for performing at least one of writing and reading of digital data in/from the disk type recording medium, wherein said lower control means includes a virtual command reception means for notifying said upper control unit that the process corresponding to the real processing command is completed on the basis of a completion of the real processing command, for receiving the virtual command of the composite command, and for controlling said disk device to move a process corresponding to the virtual command and to then standby, and wherein the process corresponding to the virtual command is a process up to a point of time when said disk device cannot continue the operation thereof unless the virtual command is changed to the real processing command.