Uncertainty modeling for hard disk drives

Masanori Honda, Peter Seiler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


A modern hard disk drive uses a dual-stage actuator to read/write data on a track with width less than 100nm. The dual-stage actuator requires an advanced controller to achieve high performance on millions of hard disk drives. This paper presents a numerical algorithm utilizing convex optimization to create an uncertainty model, for the purpose of synthesizing a robust controller, from a set of experimental frequency response data. Furthermore several practical issues of constructing an uncertainty model for the dual-stage actuator are described. The proposed method is applied to a set of frequency response data of dual-stage actuators from numerous hard disk drives to create an uncertainty model of the actuator. Then the uncertainty model is used to synthesize a robust control law, which is implemented and experimentally tested on a hard drive.

Original languageEnglish (US)
Title of host publication2014 American Control Conference, ACC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages7
ISBN (Print)9781479932726
StatePublished - Jan 1 2014
Event2014 American Control Conference, ACC 2014 - Portland, OR, United States
Duration: Jun 4 2014Jun 6 2014

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619


Other2014 American Control Conference, ACC 2014
Country/TerritoryUnited States
CityPortland, OR


  • Data storage systems
  • Robust control
  • Uncertain systems


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