Patent ID: 6178057
Filing Date: 2001-01-23
Classification: G11B

Abstract:
A disk drive comprising:a disk-shaped record medium including a plurality of servo regions radially extending on a recording surface, data regions formed by dividing the recording surface by the servo regions, zones formed by dividing radially the data regions, and data sectors which number depends on a radial position on the recording surface and which includes a first region in which reading or writing is performed using a first clock of a first frequency and a second region in which reading or writing is performed using a second clock of a second frequency;a reference clock generator for generating the first clock of the first frequency;a target sector detector for counting the first clock to detect a position of the data sector (a target sector) for which reading or writing is commanded;a compensator for compensating for a difference in the detected position of the target sector, said difference in the detected position being produced as a result of a difference in the frequency between the first clock and the second clock; anda read/write controller for reading or writing data in the sector located at the position detected by the target sector detector.