PROBLEM TO BE SOLVED: To provide a recording operation suppressing method for a removable medium recording and reproducing device capable of easily suppressing a recording function to be exclusive for reproduction for an originally recordable optical disk device for instance as the removable medium recording and reproducing device and realizing an optical disk device exclusive for the reproduction having a strong security performance as the one exclusive for the reproduction on a user side while suppressing costs such as a development cost.;SOLUTION: Immediately after firmware is incorporated inside a flash ROM (R2), by erasing adjustment value information required for recording inside the flash ROM (R2) by an instruction (3) for instance by a CPU (C2), in the optical disk which is the removable medium recording and reproducing device, the CPU (C2) is made incapable of receiving a command relating to recording and the recording function is suppressed and is not operated.;COPYRIGHT: (C)2007,JPO&INPIT
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