NON-MAGNETIC SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK

NON-MAGNETIC SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK

This non-magnetic substrate for a magnetic disk is provided with: a substrate body having two facing main surfaces; and a metal film provided on the main surfaces and made of a material which has a loss coefficient of 0.01 or greater. The thickness of the non-magnetic substrate, which is the sum of...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: OSAKABE, Kinobu
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Beschreibung
Zusammenfassung:This non-magnetic substrate for a magnetic disk is provided with: a substrate body having two facing main surfaces; and a metal film provided on the main surfaces and made of a material which has a loss coefficient of 0.01 or greater. The thickness of the non-magnetic substrate, which is the sum of the thickness T of the substrate body and the thickness D of the metal film, is 0.700 mm or less, and the ratio D/T of the thickness D of the metal film to the thickness T of the substrate body is 0.025 or greater.