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Position-Error-Based Shock Protection in HDDs

[+] Author Affiliations
Qingwei Jia

WD, a Western Digital Company, Singapore

Guoxiao Guo, Jie Yu

WD, a Western Digital Company, Irvine, CA

Paper No. ISPS2013-2911, pp. V001T03A003; 3 pages
  • ASME 2013 Conference on Information Storage and Processing Systems
  • ASME 2013 Conference on Information Storage and Processing Systems
  • Santa Clara, California, USA, June 24–25, 2013
  • Conference Sponsors: Information Storage and Processing Systems Division
  • ISBN: 978-0-7918-5553-9
  • Copyright © 2013 by ASME


This paper studies off-track write protection in HDDs. The system data integrity requirement is formulated based on the head/media and data track pitch configurations and a servo-mechanical system track misregistration (TMR) under various conditions. A write fault protection scheme is formulated based on position estimation through the current and predicted future PES (position error signal). The write fault trigger threshold determination and its impact on the system trade-offs are qualitatively discussed. The shock protection method applies to both conventional magnetic recording (CMR) and shingled magnetic recording (SMR).

Copyright © 2013 by ASME



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