Hard disk drive having contact write and recessed magnetorestive

Details Hard disk drive having contact write and recessed magnetorestive Hard disk drive having contact write and recessed magnetorestive

1997-01-03

1998-10-13

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360103, 360113, G11B 558, G11B 539, G11B 560

Patent

active

058221530

ABSTRACT:
A hard disk drive has a head with a read element adjacent to a write element, with the write element extending closer to the disk than the read element so that the write element is close to the disk for writing sharp patterns and the read element is removed from the disk to avoid wear and thermal asperities. The write element is encompassed with diamond-like carbon (DLC) to allow at least occasional dynamic contact with the disk while the read element, which includes a magneto resistive material, is disposed in a recessed area and may be covered with a thin coating of DLC to avert corrosion. The disk may have a multilayer granular media for low-noise, high-strength perpendicular data storage. Perpendicular data storage may also be provided by keeping the write element in such close proximity to the media that perpendicular write fields predominate, while perpendicular signals from the media are favored by the read element.

REFERENCES:
patent: 4669011 (1987-05-01), Lemke
patent: 5041932 (1991-08-01), Hamilton
patent: 5255141 (1993-10-01), Valstyn et al.
patent: 5455730 (1995-10-01), Dovek et al.
C. Tsang et al., IEEE Transactions on Magentics, vol. 25, No. 5, Sep. 1992, pp. 2289-2291. Study of Recessed MR Sensors with Unlaminated and Multi-Laminated Flux-Guides.

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