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Definition: write precompensation

Using a stronger magnetic field to write data in sectors that are closer to the center of the disk. In CAV recording, in which the disk spins at a constant speed, the sectors closest to the spindle are packed tighter than the outer sectors.

One of the hard disk parameters stored in a PC's CMOS memory is the WPcom number, which is the track where precompensation begins. See BIOS setup.