Patent ID: 6469858
Filing Date: 2002-10-22
Classification: G11B

Abstract:
A data storage apparatus for use with interchangeable data storage disks of potentially different weights, each such disk being replaceably loaded in the apparatus, comprising:(a) a disk drive motor for imparting rotation to a data storage disk loaded in the apparatus, the disk drive motor having a different current requirement depending upon the weight of the disk to be driven; (b) a transducer for data transfer with the rotating data storage disk; (c) a positioning motor for moving the transducer across track turns on the disk; (d) current detector means for detecting the magnitude of an electric current being consumed by the disk drive motor when the latter is driving the loaded data storage disk at a prescribed speed; (e) current control means connected between the current detector means and the positioning motor for varying the magnitude of a current supplied to the positioning motor in inverse proportion to the magnitude of the current being consumed by the disk drive motor; and (f) speed control means connected between the current detector means and the positioning motor for varying the speed of rotation of the positioning motor in inverse proportion to the magnitude of the current being consumed by the disk drive motor.