Large capacity magnetic disc apparatus with a particular relationship between pole thickness, saturated flux density, and recording wavelength
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United States of America Patent
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Sep 23, 1997
Grant Date -
N/A
app pub date -
Mar 6, 1995
filing date -
Dec 13, 1989
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Abstract
A magnetic disc apparatus has a large recording density of 120 megabits per square inch or more, and defines a relationship among a pole thickness (Pt) of thin-film magnetic heads disposed in the magnetic disc apparatus, and a saturation flux density (Bs) of cores of the heads and a recording wavelength (.lambda.) for the thin film magnetic discs have a coercivity of 1800 Oe or more, wherein a levitation space between the head and the disc is 0.15 .mu.m or less.
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