Vibration minimized access control for disk drives

Author

Mizoshita, Y. ; Hasegawa, S. ; Takaishi, K.

Author_Institution

File Memory Lab., Fujitsu Labs. Ltd., Atsugi, Japan

Volume

32

Issue

3

fYear

1996

fDate

5/1/1996 12:00:00 AM

Firstpage

1793

Lastpage

1798

Abstract

A new access control method called SMART (Structural Vibration Minimized Acceleration Trajectory) has been developed for hard disk drives. The access formula is derived from a minimum-jerk cost function. The closed loop of access mode is based on velocity control and the target velocity to keep minimum-jerk is easily calculated as a function of position by a DSP controller. With SMART control the high harmonics of the actuator acceleration are suppressed in comparison with conventional control. Residual vibration after the access operation and spacing fluctuation of the head slider are both greatly decreased

Keywords

hard discs; magnetic recording; minimisation; velocity control; vibrations; DSP controller; SMART control; access control; actuator; closed loop mode; hard disk drive; harmonics; head slider; minimum-jerk cost function; spacing fluctuation; structural vibration minimized acceleration trajectory; velocity control; Acceleration; Access control; Cost function; Digital signal processing; Disk drives; Fluctuations; Hard disks; Intelligent actuators; Velocity control; Vibration control;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.492867

Filename

492867