Hard disk drive

Details Hard disk drive Hard disk drive

1998-09-08

1999-06-01

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360135, G11B 5596, G11B 5712

Patent

active

059093412

ABSTRACT:
A hard disk drive includes a magnetic disk used as a magnetic recording medium, and a magnetic head for applying magnetic fields to the disk to record data and for detecting magnetic fields from the disk to reproduce data. During recording and reproducing, the head is moved relative to the disk so as to define a track, which is a series of a number of recording bits, on the disk. At this time, the head is brought into contact with the disk, with a head contact width in the track width direction. The disk has a surface texture which presents a single peak amplitude value falling in a range of being equal to or more than 0.5 nm, and equal to or less than the recording bit length, when the surface texture is factorized into frequency compositions by means of Fourier transform. A wave length for providing the peak amplitude value falls in a range of being ten times the recording bit length or more, and equal to or less than the head contact width.

REFERENCES:
patent: 4762742 (1988-08-01), Sonoda et al.
patent: 5225950 (1993-07-01), Crane
patent: 5302434 (1994-04-01), Doerner et al.
patent: 5307223 (1994-04-01), Doerner et al.
patent: 5353182 (1994-10-01), Nakamura et al.

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