Patent ID: 7619842
Filing Date: 2009-11-17
Classification: G11B

Abstract:
1. A method of determining optimal values for a write current of a magnetic recording device, the method comprising: writing test data with an initial write condition and evaluating a performance related to the pole tip protrusion (PTP) of a magnetic head to detect a write sector where a performance evaluation value thereof begins to satisfy a threshold criterion; determining a PTP control duration defined as a duration between a write start sector where the test data is initially written and a sector immediately preceding the write sector where the performance evaluation value begins to satisfy the threshold criterion; varying an overshoot value of a PTP control signal that determines an overshoot amplitude of a write current and evaluating the PTP-related performance by applying the varied overshoot value of the PTP control signal over the determined PTP control duration; and selecting the overshoot value of a PTP control signal when a PTP-related performance evaluation value measured in the PTP control duration is most similar to a PTP-related performance evaluation value measured outside the PTP control duration.