Servo bandwidth and positioning accuracy design for high track density disk drives

Author

Yamaguchi, Takashi ; Usui, Kazuaki ; Okuyama, Atsushi ; Yasuna, Kei ; Akagi, Kyo ; Shishida, Kazuhisa

Author_Institution

Mech. Eng. Res. Lab., Hitachi Ltd., Ibaraki, Japan

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2216

Lastpage

2218

Abstract

Possibility of achieving positioning accuracy to meet the areal density of 40 Gb/in² has been studied. Stationary and nonstationary position errors are shown, and the servo design approaches have been proposed. A precise model of head-positioning system has been developed, and the required open loop servo bandwidth is estimated using the model. The experimental results using 2.5-inch HDD show that 750 Hz to 1 kHz servo bandwidth (open loop crossover frequency) is effective to achieve 40 nm positioning accuracy during track-following to meet 60 kTPI for 40 Gb/in²

Keywords

disc drives; hard discs; position control; servomechanisms; 2.5 in; 750 Hz to 1 kHz; HDD; areal density; high track density disk drives; nonstationary position errors; open loop crossover frequency; open loop servo bandwidth; positioning accuracy design; servo bandwidth; servo design; stationary position errors; track-following; Actuators; Bandwidth; Control systems; Disk drives; Electric shock; Laboratories; Mechanical engineering; Servomechanisms; Target tracking; Vibrations;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908364

Filename

908364