Title :
Identification of contributors to HDD servo errors by measuring PES only
Author :
Hyun Seok Yang ; Cheol Hoon Park ; Jun Jeong ; Young-Pil Park
Author_Institution :
CISD, Yonsei Univ., Seoul, South Korea
Abstract :
In this paper, disturbances, the source of TMR being barrier to high track density of HDD are analyzed quantitatively using PES only without extra sensor. Disturbances are separated into RRO and NRRO, then, NRRO is separated into input torque disturbance, output disturbance, and noise. The effect of each disturbance to PES is compared. Using separated disturbances, PSD of PES RRO and NRRO are predicted for various gain levels in track following servo, and they are compared with PSD of PES measured in experiment. We propose that it can be used to predict servo performance accurately.
Keywords :
disc drives; errors; hard discs; servomechanisms; hard disk drive; noise; nonrepeatable run out; position error signal measurement; power spectral density; repeatable run out; torque disturbance; track density; track following servo; track misregistration; Acoustical engineering; Actuators; Density measurement; Gain measurement; Noise measurement; Pressure measurement; Rail to rail outputs; Servomechanisms; Torque; Transfer functions;
Conference_Titel :
Asia-Pacific Magnetic Recording Conference, 2000. APMRC 2000
Conference_Location :
Tokyo, Japan
Print_ISBN :
0-7803-6254-3
DOI :
10.1109/APMRC.2000.898921
