Patent ID: 6710956
Filing Date: 2004-03-23
Classification: G11B

Abstract:
A method of recording data on a disc drive, comprising steps of:(a) supplying write current impulse to a preamp current driver circuit of a write head of the disc drive; (b) inputting an input data pattern into the preamp current driver circuit; (c) interrupting the write current impulse using a plurality of voltage driven switches in the preamp current driver circuit to provide a write current impulse of positive and negative polarity based on the input data pattern; (d) interrupting the interrupted write current impulse using a plurality of current driven switches in the preamp current driver circuit to further provide a sequence of write current impulses of positive and negative polarity to a write head of the disc drive for effecting magnetic recording on the disc, based on the input data pattern; and (e) interrupting the write current impulse using the plurality of voltage driven switches anytime during a last two consecutive write current impulses of the sequence of write current impulses to change polarity of the write current impulse for a next input data pattern.