Title :
A technique for evaluating track deviation at nanometer-scale accuracy
Author :
Yasuna, Kei ; Yamaguchi, Takashi ; Shishida, Kazuhisa ; Hamaguchi, Tetsuya
Author_Institution :
Mech. Eng. Res. Lab., Hitachi Ltd., Tsuchiura, Japan
fDate :
7/1/2001 12:00:00 AM
Abstract :
A technique for evaluating track deviation in magnetic disk drives has been developed. The technique uses an external position sensor and an error cancellation sequence, and enables measurement of track-to-track spacing. The resolution of track position is less than 2 nm. The repeatability is less than 5 nm. The technique helps reveal track alignment error, which needs to be reduced to achieve over-100-KTPI recording
Keywords :
disc drives; error correction; hard discs; magnetic heads; position measurement; error cancellation sequence; external position sensor; magnetic disk drives; nanometer-scale accuracy; repeatability; track alignment error; track deviation; track position; track-to-track spacing; Bandwidth; Disk drives; Disk recording; Magnetic heads; Magnetic recording; Magnetic sensors; Position measurement; Rotation measurement; Servomechanisms; Tracking loops;
Journal_Title :
Magnetics, IEEE Transactions on
