Dynamic compensation of hard-disk R/W head and head-stack

Authors:
Nuapett Sarasiri;Arthit Srikaew;Sarawut Sujitjorn
Affiliations:
School of Electrical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand;School of Electrical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand;School of Electrical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand
Venue:
WSEAS TRANSACTIONS on SYSTEMS
Year:
2010

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Abstract

R/W heads of HDDs are inherently unstable or highly underdamped. Compensations are always necessary for the heads and actuators to function properly under motion control. This article provides the control models of the single-head and the head-stack. Comparison studies of various compensation structures are presented. Resonance issue has been addressed with the corresponding mitigation technique. The design optimization to improve the R/W head performance and stability has been achieved via adaptive tabu search.