Patent ID: 7817517

Claim:
A disc recording and reproducing device using a disc as a recording media, the device comprising: a write inhibit flag readout and judging unit for reading out a write inhibit flag for protecting a recorded portion of the disc; a write inhibit flag writing unit for writing the write inhibit flag; a write inhibit flag memory for storing the write inhibit flag read out by the write inhibit flag readout and judging unit, when the disc is loaded; a first write-enable state setting unit for checking the write inhibit flag stored in the write inhibit flag memory when the disc is loaded, and for setting the write inhibit flag on the disc to a write-enable state when the write inhibit flag in the memory is in a write-protect state; a recording history information storage for storing a history of recording information on the disc; and a first write-protect state setting unit for checking information in the recording history information storage when the disc is unloaded, and for setting the write inhibit flag on the disc to the write-protect state when data is recorded on the disc or the write inhibit flag stored in the write inhibit flag memory is in the write-protect state and no data is recorded on the disc.