Title :
Demonstration of track following technique based on discrete track media
Author :
Watanabe, Kenjiro ; Takeda, Toru ; Okada, Kanzo ; Takino, Hiroshi
Author_Institution :
Sony, Tokyo, Japan
fDate :
11/1/1993 12:00:00 AM
Abstract :
A discrete-track medium and drive have been developed. The tracks are on 3.6-μm-wide lands separated by 1.6-μm-wide grooved guardbands on a 64-mm disk. The slider was designed considering the grooves. The track-following signals are obtained through a newly developed MR head from marks embossed simultaneously with the formatting of the discrete tracks. Track eccentricity on the spindle has been overcome by introducing feedforward compensation. An areal density of 600 kb/mm2 (~400 Mb/in2) was achieved using an external-clock driven partial-response maximum-likelihood
Keywords :
magnetic disc storage; magnetic heads; magnetic recording; magnetoresistive devices; maximum likelihood estimation; 64 mm; CoPt thin film; MR head; NiFe; Permalloy layers; areal density; discrete-track medium; external-clock driven partial-response maximum-likelihood; feedforward compensation; magnetic disc; magnetic recording; magnetoresistive head; rewritable optical disc drives; track eccentricity; track-following signals; Clocks; Disk drives; Disk recording; Feeds; Magnetic heads; Magnetic recording; Magnetic separation; Optical films; Servomechanisms; Time measurement;
Journal_Title :
Magnetics, IEEE Transactions on
