Magnetic disk apparatus and read waveform equalizing method using stored tap coefficients for a transversal filter

摘要

Prior to starting the use of an apparatus, an isolated waveform writing section writes a predetermined isolated waveform into a predetermined region of each track of a disk medium by designating a head number and a track number. The isolated waveform is subsequently read out by an isolated waveform reading section and is quantized by an analog/digital converter. Tap coefficients of a transversal filter are calculated by a tap coefficient calculating section. The tap coefficients calculated by the tap coefficient calculating section are stored in a memory on the basis of the track number and head number used when the isolated waveform is written. Upon reproduction during the use of the apparatus, a tap coefficient setting section reads out the corresponding tap coefficients from the memory on the basis of the track number and head number designated by a seek command and sets to the transversal filter.