Discrete track media produced by underlayer laser ablation
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United States of America Patent
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Oct 31, 2000
Issued Date -
N/A
app pub date -
Oct 9, 1997
filing date -
Sep 6, 1995
priority date (Note) -
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Abstract
The invention provides discrete track magnetic recording media and methods for their fabrication. A discrete track servo pattern is imposed on an underlayer, over which a magnetic recording layer is deposited. The pattern is preferably imposed by selective laser ablation of the underlayer. Ideally the underlayer comprises sputtered carbon, which has been found to improve the signal-to-noise ratio of the subsequent magnetic layer. Optionally, a contact start/stop zone having a relatively rough surface texture is imposed, also by selective laser ablation of the underlayer.
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