Title :
Modeling and TMR (track misregistration) budget design for head-positioning of high track-density disk drives
Author :
Yamaguchi, Takashi ; Usui, Kazuaki ; Hirai, Hiromu ; Tomiyama, Futoshi ; Numasato, Hidehiko ; Hamada, Yousuke ; Shishida, Kazuhisa
Author_Institution :
Mech. Eng. Res. Lab., Hitachi Ltd., Ibaraki, Japan
fDate :
3/1/1999 12:00:00 AM
Abstract :
A design tool for track misregistration (TMR) budget of disk drives have been developed. This tool includes R/W head, disk, channel and head-positioning model. An appropriate parameter set which satisfies a given soft error rate (SER) and off-track capability (OTC), is derived using this tool. It is shown that results of simulations using this tool match experimental ones. A TMR budget design for 10 Gbit/in2 is calculated. In this design, positioning accuracy of NRRO and RRO should be 0.096 μm (±3σ) and 0.084 pm (±3σ) respectively to achieve 31.4 ktpi
Keywords :
disc drives; hard discs; magnetic heads; position control; servomechanisms; NRRO; RRO; head-positioning model; high track-density disk drives; nonrepeatable runout; off-track capability; parameter set; positioning accuracy; read/write head; repeatable runout; soft error rate; track misregistration; Bit error rate; Design methodology; Disk drives; Error analysis; Laboratories; Mechanical engineering; Memory; Noise figure; Noise level; Signal to noise ratio;
Journal_Title :
Magnetics, IEEE Transactions on
