WRITE STRENGTH CONTROL METHOD OF HARD DISC DRIVE AND RECORDING MEDIUM ADAPTED THE SAME

A write strength control method of a hard disc drive and a recording medium in which a program appropriate for the same is recorded are provided to prevent the weak writing and the recording of an abnormal signal. A process for reading the reference value AGC(Automatic Gain Control) recorded in a maintenance area is performed(S702). The average value AGC of gain of an AGC circuit is obtained by reading a measuring area(S704). A process for calculating the difference dAGC between the reference value AGC0 and the measured value AGC is performed(S706). A process for discriminating whether the difference is within the predetermined detection limitation X is performed(S708). When sign of the dAGC is positive, the write strength is increased(S714).