Magnetic disk with a porous substrate

Details Magnetic disk with a porous substrate Magnetic disk with a porous substrate

1986-07-28

1988-05-03

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

Disk

428 65, G11B 582

Patent

active

047424206

ABSTRACT:
A magnetic recording disk having a rigid substrate disc is provided with an annular air gap defined between inner and outer peripheral bonding rings. A flexible disc sheet having a recording surface is placed over the arrangement and held tight against the peripheral bonding rings while the inner and outer edges of the flexible disc sheet are bonded to the bonding rings. In order to avoid deformation of the recording surface due to thermal expansion of the air trapped in the gap, the substrate is made porous to provide air passages between the air gap and the external atmosphere.

REFERENCES:
patent: 3737880 (1973-06-01), Kelley
patent: 4376963 (1983-03-01), Knoop et al.
patent: 4623570 (1986-11-01), Alexander et al.

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