Implementation of adaptive feedforward cancellation algorithms for pre-embossed rigid magnetic (PERM) disks

Author

Lee, Ho Seong

Author_Institution

Seagate Technol., Scotts Valley, CA, USA

Volume

33

Issue

3

fYear

1997

fDate

5/1/1997 12:00:00 AM

Firstpage

2419

Lastpage

2423

Abstract

Pre-embossed rigid magnetic (PERM) disks provide the potential to improve storage capacity, simplify the manufacturing process, and reduce overall manufacturing costs. Since the tracks including servo sectors are pre-embossed and assembled into the drive, there is runout mainly due to the inherent eccentricity. In order to compensate repeatable runout, an adaptive feedforward cancellation (AFC) scheme is implemented. It is shown through experiments that the AFC is effective in selectively canceling the desired frequency. Cancellation of the first three harmonic components is demonstrated, and experimental results are presented. Without track following servo, the AFC is able to reduce the position error signal (PES) by 83% of the track pitch

Keywords

feedforward; hard discs; PERM disk; adaptive feedforward cancellation algorithm; eccentricity; harmonic component; position error signal; pre-embossed rigid magnetic disk; repeatable runout; Amplitude estimation; Assembly; Automatic frequency control; Disk drives; Frequency estimation; Magnetic separation; Manufacturing processes; Phase estimation; Rail to rail outputs; Servomechanisms;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.573868

Filename

573868