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Speed Optimization of a Servo Track Write Process

IP.com Disclosure Number: IPCOM000058628D
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Leonard, AW Quick, GM Shreeve, JJ [+details]

Abstract

The speed of rotation of a disk file is optimized to reduce vibration and hence increase the quality of tracks written during a servo track writing process which employs the product heads to write the servo data. To select the optimum speed, test servo tracks are written on a disk and then read at seven different speeds of rotation. The position error signals for each of the speeds are then monitored and the speed showing the lowest non-repeatable misregistration (NRM) is chosen for the complete servo writing operation. The technique uses a simple measurement of NRM that is both quicker and more accurate than previous methods. The optimization algorithm tunes each file to its own vibrational characteristics with only a slight increase in process time.