MAGNETIC DISK DRIVE AND GUARANTEE METHOD OF ITS MAGNETIC RECORDING FUNCTION

PROBLEM TO BE SOLVED: To provide a magnetic disk drive, in which the normal/abnormal state of the magnetic recording function is discriminated by detecting the magnitude of a crosstalk between lines and the magnetic recording function is guaranteed. SOLUTION: By utilizing the fact that an amplitude of the crosstalk between lines to a reproducing side line from a recording side line is increased when a load inductance of the recording side line is reduced due to the short circuit of a coil for recording head, or the like, a detection part 36 of the amplitude of the crosstalk between lines is arranged in a preamplifier 20 as a detection means of the abnormality of the coil (change of inductance). A detection circuit 31 of the amplitude of the crosstalk between lines is arranged by being branched from a branching circuit 30 in a reproduction circuit of the preamplifier 20, and by preparing the function to conclude the abnormal recording state when the amplitude is further increased to the threshold or larger, the recording function on the preamplifier 20 can be guaranteed. Also, for the short circuit in the line around the head, the abnormal recording state is detectable since the inductance is similarly reduced. COPYRIGHT: (C)2004,JPO&NCIPI