Title :
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
fDate :
7/1/2004 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.832364
