Title :
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
fDate :
9/1/2000 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
