Title :
RRO/NRRO characteristics in mobile HDDs
Author_Institution :
Hitachi Global Storage Technol. Japan, Ltd., Fujisawa
Abstract :
The characteristics of repeatable runout (RRO) and non-repeatable runout (NRRO) of HDDs have to be clarified for higher tracks per inch since the static positional accuracy has almost reached its limit. The most dominant component in NRRO and even in RRO is torque disturbance. We experimentally estimated that the rate of windage-the dominant component of torque disturbance-using a mixture of helium and air.
Keywords :
disc drives; gas mixtures; hard discs; torque; tracking; RRO-NRRO characteristics; mobile HDD; nonrepeatable runout; repeatable runout; static positional accuracy; torque disturbance; windage; Hard disks; Helium; Low-frequency noise; Multilevel systems; Rail to rail outputs; Servomechanisms; Torque; Vibrations; Working environment noise; Writing; FIV; NRRO; RRO; STW; self-servo-write; servo-writing; windage;
Conference_Titel :
Magnetic Recording Conference, 2009. APMRC '09. Asia-Pacific
Conference_Location :
Singapore
Print_ISBN :
978-9810-82191-3
DOI :
10.1109/APMRC.2009.4925375
