Patent ID: 6696832
Filing Date: 2004-02-24
Classification: G11B

Abstract:
A method of identifying damaged magnetic transducer heads during the manufacture of magnetic disc storage systems, comprising:(a) setting a write current to a first level, setting an overshoot amount to a first amount, writing data to a magnetic storage disc using a magnetic transducer head under test at the first write current level and the first overshoot amount; (b) reading back the data written in step (a); (c) calculating a first bit error rate based upon steps (a) and (b); (d) setting the write current to a second level, setting the overshoot amount to a second amount which is different from the first overshoot amount, writing data to the magnetic disc using the magnetic head under test at the second write current level and the second overshoot amount; (e) reading back the data written in step (d); (f) calculating a second bit error rate based upon steps (d) and (e); and (g) determining if the transducer head under test is physically damaged based upon a comparison of the first bit error rate to the second bit error rate.