Patent ID: 8908484

Claim:
An optical disk library device for carrying a plurality of optical disks and recording and reproducing information on the optical disks, the device comprising: a recording/reproducing device that records and reproduces information on the optical disk; and a library controller that transmits and receives information to/from the host controller connected to the optical disk library device, wherein the recording/reproducing device reproduces an area recorded on the optical disk, includes a recording quality storage part for storing quality information showing a recording state of the area, and when data to be recorded on the optical disk via the library controller is transmitted to the recording/reproducing device from the host controller, the recording/reproducing device records the transmitted data on the optical disk, and wherein the recording/reproducing device transmits reproduced data to the host controller via the library controller while storing the quality information at the time of reproduction in the recording quality storage part by a first instruction from the host controller, and transmits the quality information stored in the recording quality storage part to the host controller via the library controller by a second instruction from the host controller.