Patent ID: 7426163

Claim:
A method of preventing a malfunction of a disc drive, comprising: a first monitoring operation determining whether an operative state of the disc drive is stable when a disc is loaded into the disc drive; determining if the operative state of the disc drive is stable; controlling a turning on of a correction function for a minimum pit length, if the operative state of the disc drive is determined to be stable; a second monitoring operation determining whether the operative state of the disc drive is stable after turning the correction function for the minimum pit length on; determining if the operative state of the disc drive is unstable; and controlling a turning off of the correction function, if the operative state of the disc drive is determined to be unstable from a second monitoring result, wherein the determining if the disc drive is unstable comprises: determining if a period of a synchronization signal supplied from a digital signal processing unit is not regular, determining if after a servo unit is requested to turn on a focus lock operation or a constant linear velocity lock operation, a level of a response signal corresponding to the turn on operation of the focus lock or the CLV lock generated in the servo unit does not meet a specified standard, and determining if the level or the phase of a RF signal reproduced when a host computer requests the disc drive to perform “STOP” operation during a normal reproduction operation is generated abnormally.