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[ The PC Guide | Systems and Components Reference Guide | Hard Disk Drives | Hard Disk Geometry and Low-Level Data Structures | Hard Disk Data Tracks, Cylinders and Sectors ]

Write Precompensation

As discussed in the section on zoned bit recording, older hard disks used the same number of sectors per track. This meant that older disks had a varying bit density as you moved from the outside edge to the inner part of the platter. Many of these older disks required that an adjustment be made when writing the inside tracks, and a setting was placed in the BIOS to allow the user to specify at what track number this compensation was to begin.

This entire matter is no longer relevant to modern hard disks, but the BIOS setting remains for compatibility reasons. Write precompensation is not done with today's drives; even if it were, the function would be implemented within the integrated controller and would be transparent to the user.

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