Shawn P Casey

US Patent:

6349464, Feb 26, 2002

Filed:

May 31, 2000

Appl. No.:

09/584837

Inventors:

Raffi Codilian - Irvine CA
Shawn E. Casey - San Jose CA

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 542

US Classification:

2960303, 360 9703, 3602641, 3602642

Abstract:

A method of making a balance-compensated (BC) rotary actuator for use in a rotatable BC head stack assembly (HSA) portion in a disk drive based upon track-follow characteristics of a rotatable test HSA portion is provided. The test HSA portion includes a test rotary actuator having a test actuator weight specification. The test rotary actuator has an actuator body portion, a test pivot axis extending through the actuator body portion and a head connected to the actuator body portion. The test rotary actuator is controlled to rotate about the test pivot axis for positioning the head over a selected disk track. The test rotary actuator has a test rotary actuator center-of-gravity torque vector associated therewith about the test pivot axis. The method provides for vibrating the disk drive at a vibration frequency in order to vibrate the test HSA portion. Position error information is read using the head while performing a track-follow operation during the vibrating of the test HSA portion.