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A New Correction Algorithm of Servo Track Writing Error in High-Density Disk Drives

고밀도 디스크 드라이브의 서보트랙 기록오차 보정 알고리즘

  • 강창익 (제주대학교 해양계측공학과) ;
  • 김창환 (대전대학교 컴퓨터공학부)
  • Published : 2003.04.01

Abstract

The servo tracks of disk drives are constructed at the time of manufacture with the equipment of servo track writer. Because of the imperfection of servo track writer, disk vibrations and head fluctuations during servo track writing process, the constructed servo tracks might deviate from perfect circles and take eccentric shapes. The servo track writing error should be corrected because it might cause interference with adjacent tracks and irrecoverable operation error of disk drives. The servo track writing error is repeated every disk rotation and so is periodic time function. In this paper, we propose a new correction algorithm of servo track writing error based on iterative teaming approach. Our correction algorithm can learn iteratively the servo track writing error as accurately as is desired. Furthermore, our algorithm is robust to system model errors, is computationally simple, and has fast convergence rate. In order to demonstrate the generality and practical use of our work, we present the convergence analysis of our correction algorithm and some simulation results.

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