Magnetic duplication for precise servo writing on magnetic disks

Author

Suzuki, Hiroyuki ; Komoriya, Hitoshi ; Nakamura, Yutaka ; Hirahara, Takao ; Yasunaga, Tadashi ; Nishikawa, Masakazu ; Nagao, Makoto

Author_Institution

Magnetic Disk Drive Lab., Fujitsu Labs. Ltd., Kanagawa, Japan

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2528

Lastpage

2530

Abstract

A servo pattern of a 20 Gbit/in² level was directly duplicated on hard disks by using a magnetic duplication method, and the accuracy of the signal and the following performance on the duplicated servo pattern were evaluated. The phase servo pattern was composed of straight lines and was lithographically formed on a mastering disk. The period accuracy of the readback signal was very high. The repeatable position error for adjacent tracks in a prototype drive was measured, and the difference between two adjacent RPE trajectories was sufficiently small. The magnetic duplication method showed the possibility of precise servo-track writing for high-density hard disk drives.

Keywords

hard discs; servomotors; RPE trajectories; duplicated servo pattern; hard disks; high-density hard disk drives; magnetic disks; magnetic duplication; phase servo pattern; precise servo writing; precise servo-track writing; readback signal; repeatable position error; Disk recording; Hard disks; Magnetic devices; Magnetic flux; Magnetic recording; Master-slave; Saturation magnetization; Servomechanisms; Soft magnetic materials; Writing; Magnetic duplication; RPE; phase servo pattern; repeatable position error; servo-track writing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832364

Filename

1325559