Hard disk drive servo technology for media-level servo track writing

Author

Takaishi, Kazuhiko ; Uematsu, Yukihiro ; Yamada, Tomoyoshi ; Kamimura, Mitsuo ; Fukushi, Masanori ; Kuroba, Yasumasa

Author_Institution

HDD Dev. Dept., Fujitsu Ltd., Kawasaki, Japan

Volume

39

Issue

2

fYear

2003

fDate

3/1/2003 12:00:00 AM

Firstpage

851

Lastpage

856

Abstract

Hard disk drive (HDD) servo technology for media-level servo track writing (MLSTW) is developed. MLSTW is the process of writing servo signals on magnetic disks before they are assembled in drives. It supplies a solution to achieve low-cost and accurate means of servo-signal writing. The HDD servo controller for MLSTW drives compensates for radial and rotational distortions of the servo signals (e.g., track-address, eccentricities, and servo-signal timing) that are inherent in the MLSTW method. The authors prove that the positioning accuracy is improved and the seek time is unchanged by using the new servo controller for HDDs with MLSTW disks.

Keywords

calibration; compensation; disc drives; distortion; feedforward; hard discs; position control; servomechanisms; timing jitter; HDD servo controller; HDD servo technology; calibration; distortion compensation; eccentricities; feedforward systems; hard disk drive servo; magnetic disk recording; media-level servo track writing; positioning accuracy; radial distortions; rotational distortions; seek time; servo signals; servo-signal timing; servo-signal writing; track-address; Actuators; Disk drives; Hard disks; Magnetic heads; Magnetic separation; Production; Servomechanisms; Signal processing; Throughput; Writing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.808939

Filename

1190113