Title :
Improvement of RRO using hybrid-type STW for hard disk drives
Author :
Inoue, T. ; Horisaki, M. ; Seo, Y. ; Yamazaki, S.
Author_Institution :
Data Storage & Retrieval Syst. Div., Hitachi Ltd., Kanagawa, Japan
Abstract :
Accurate servo track writers (STWs) are indispensable for hard disk drives (HDDs) with high track density. We have developed a prototype hybrid-type STW, which has two writing stages, and compared the servo patterns with those by the conventional STW. The experimental results are described showing that the hybrid-type STW reduces the maximum value of repeatable runout (RRO) by about 40% and the track misregistration (TMR) in the HDD.
Keywords :
disc drives; hard discs; servomechanisms; HDD TMR; RRO improvement; hard disk drives; high track density; hybrid-type STW; repeatable runout; servo track writers; track misregistration; writing stages; Assembly; Costs; Disk drives; Frequency; Hard disks; Rail to rail outputs; Sampling methods; Servomechanisms; Servomotors; Writing;
Conference_Titel :
Asia-Pacific Magnetic Recording Conference, 2000. APMRC 2000
Conference_Location :
Tokyo, Japan
Print_ISBN :
0-7803-6254-3
DOI :
10.1109/APMRC.2000.898938
