Patent ID: 7499390

Claim:
A device for recording or reproducing data on/from an optical disk, the optical disk inserted in a protection casing, the device comprising: a receiving unit operative to receive at least the optical disk inserted in the protection casing; a pickup unit to recording or reading data on/from the optical disc; a servo unit to control the pickup unit; data processor to process data output from the pickup unit or to transfer data to be recorded to the pickup unit; and a controller coupled to at least servo unit and data processor to control recording or reading operation of data on/from the optical disk, wherein the protection casing comprises, a casing body having a receiving space therein and an access port formed at a first side of the casing body; and a disk holder insertable into the casing body via the access port, one of the disk holder and the first side of the casing body being structured such that the disk holder is prevented from being incorrectly inserted into the casing body, wherein the entire disk holder is contained within the casing body, wherein the casing body includes a first indentation disposed at a top center of the access port, and the disc holder includes a first projection disposed at a top center thereof for fitting into the first indentation, and wherein the first indentation includes a groove off-centered in the first indentation, and the disk holder further includes a second projection off-centered from the first projection.