Data storage disk having improved tracking capability

Details Data storage disk having improved tracking capability Data storage disk having improved tracking capability

1994-07-15

1996-07-16

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360 7701, 360 7702, 360 7707, G11B 582, G11B 558, G11B 5596

Patent

active

055372821

ABSTRACT:
In the present invention a magnetic data storage includes disk recesses formed in the magnetic layer. The recesses are located in pairs on opposite sides of the data tracks, and the disk is initialized by applying a magnetic field perpendicular and parallel to the surface of the disk, thereby forming positive magnetic poles at respective edges of the recesses. The read/write head generates a signal as it passes over the pairs of recesses, and this signal is used to adjust the position of the head with respect to the data track. The recesses may advantageously be arranged in a stair step pattern which results in a signal having the same sequential characteristics for adjacent data tracks. The spacing between the recesses may be used to represent ROM data or header information, such as track addresses or synchronization marks.

REFERENCES:
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patent: 4746580 (1988-05-01), Bishop et al.
patent: 4769802 (1988-09-01), Tatsuguchi
patent: 4856108 (1989-08-01), Tinet
patent: 4935278 (1990-06-01), Krounbi et al.
patent: 4961123 (1990-10-01), Williams et al.
patent: 5296995 (1994-03-01), Yonezawa et al.
patent: 5325244 (1994-06-01), Takano et al.
patent: 5402278 (1995-03-01), Morita
patent: 5402411 (1995-03-01), Maeda et al.
"Demonstration of Track Following Technic Based On Discrete Track Media", K. Watanabe et al., Digest of Intermag--Stockholm, Sweden, 1993, 1 pg.
"Discrete-Track Magnetic Disk Using Embossed Substrate", T. Ishida et al., IEICE Trans. Fundamentals, vol. E76-A, No. 7, Jul. 1993.

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