Optimizing storage capacity by smoothly varying track pitch across a disk surface
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United States of America Patent
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Aug 11, 2009
Grant Date -
Apr 16, 2009
app pub date -
Oct 10, 2007
filing date -
Oct 10, 2007
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Abstract
A method for operating a fixed media hard disk drive using a plurality of disks on each of which the ratio of servo track pitch to data track pitch is smoothly varied across the surface of the disk as data is being written. The method allows the density of data on each disk to be independently varied, the total data capacity of a disk to be independently varied and introduces a degree of flexibility into the process of testing disk formatting. The method includes the use of a smooth and continuous function having a set of adjustable parameters, by whose definition a relationship between the two pitches is established within the data band. The method can also be applied to disks that are divided into radial zones to take advantage of additional properties of data writing and reading within a hard disk drive.
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