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Minimizing Effects of Vibration at Servowrite

IP.com Disclosure Number: IPCOM000058172D
Original Publication Date: 1988-Sep-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Reed, D Fowler, RV [+details]

Abstract

A method is described to reduce misregistration of servo samples on disk files caused by mechanical vibrations during the servo track writing process when using product heads to write the samples. This is achieved by monitoring the position of the actuator before writing each servo sector and making an individual estimate of whether or not to write that sector. Non-written sectors are written on subsequent revolutions of the disk when the position of the actuator is within acceptable limits. Servo-track quality can effectively be traded against process time. Two important parameters associated with disk file servo-track quality are the mean track pitch and the statistics of variations about the mean as a result of error in the radial location of individual samples.