Magnetic disk for hard disk drives

Details Magnetic disk for hard disk drives Magnetic disk for hard disk drives

2008-05-28

2010-12-07

Rickman, Holly (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

Reexamination Certificate

active

07846567

ABSTRACT:
The present invention provides a magnetic disk in a discrete track medium and a patterned medium, which prevents the loss of the magnetically recorded data when a head of a magnetic disk device contacts the magnetic disk, and a manufacturing method thereof. A magnetic disk has a protrusion as a non-magnetic member formed on a disk surface to prevent a head from being in contact with a recording section. When the protrusion formed in a disk substrate collides against the head, the protrusion7does not collapse, and accordingly, the recording layer is not damaged. Alternatively, concave and convex portions are formed on the substrate surface to use the convex portion as the protrusion.

REFERENCES:
patent: 2006/0063042 (2006-03-01), Takai
patent: 2006/0163195 (2006-07-01), Bandic
patent: 2006/0269795 (2006-11-01), Yanagita
patent: 2007/0000861 (2007-01-01), Kamata
patent: 103 52 778 (2004-06-01), None
patent: 05-258291 (1993-10-01), None
patent: 2005-251270 (2005-09-01), None
patent: 2006-147148 (2006-06-01), None
patent: WO 93/12520 (1993-06-01), None
patent: WO 2007/055345 (2007-05-01), None

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