Implementation of variable bit density recording in storage disc drives
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United States of America Patent
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May 6, 2003
Grant Date -
Oct 3, 2002
app pub date -
Jul 12, 1999
filing date -
Jul 13, 1998
priority date (Note) -
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Abstract
The present invention pertains to an apparatus and method for recording data in a variable bit density disc drive. The disc drive includes a recording surfaces, each having a corresponding head for recording data on the recording surface. At least one head is operated at a different recording frequency from the other heads, creating a variable bit density for the different recording surfaces. The combination of head recording frequencies is determined following an error testing operation and a unique physdisc lookup table is created based on the determined recording frequencies. The physdisc lookup table is used to allocate data sectors and to convert between logical and physical block addresses.
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