Patent ID: 6735040
Filing Date: 2004-05-11
Classification: G11B

Abstract:
In a data storage device having data stored in tracks, each track including a plurality of servo sectors, the data storage device further including a transducer operable for accessing information in the servo sectors, a method of detecting defective servo sectors, comprising:accessing a first servo sector on one of the tracks with the transducer; determining if a position error signal (PES) value associated with the first servo sector exceeds a predetermined PES threshold value; if the PES value associated with the first servo sector exceeds the predetermined PES threshold value, identifying the first servo sector as defective; if the PES value associated with the first servo sector does not exceed the predetermined PES threshold value, determining if a transducer velocity signal associated with the first servo sector exceeds a predetermined velocity threshold value; and if the transducer velocity signal associated with the first servo sector exceeds the predetermined velocity threshold value, identifying the first servo sector as defective.