Title :
Advanced DC-free track code pattern using diphase code for perpendicular recording
Author :
Hamaguchi, Takehiko ; Maeda, Hideaki ; Shishida, Kazuhisa
Author_Institution :
R&D Group, Hitachi Ltd., Kanagawa, Japan
Abstract :
We describe an advanced dc-free track code pattern that uses diphase code for a perpendicular recording. Track code error rates are compared between diphase code, dummy-bit code, and conventional dibit code. The diphase code improves writing ability during servo track writing and maintains equivalent medium noise. Therefore, the diphase code exhibits a superior track code error rate within a wide range of radius on experimental hard disk drives.
Keywords :
encoding; hard discs; magnetic recording noise; perpendicular magnetic recording; signal resolution; DC-free track code pattern; dibit code; diphase code; dummy-bit code; hard disks; magnetic noise; perpendicular magnetic recording; servo systems; servo track writing; signal resolution; track code error rates; Drives; Error analysis; Giant magnetoresistance; Hard disks; Magnetic heads; Magnetic noise; Perpendicular magnetic recording; Servomechanisms; Shape measurement; Writing;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.832489
