write precompensation

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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.

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hard disk configuration
precomp

WPcom

Features include data rates from 64 to 200 Mbits/s, fully programmable adaptive equalizers, write precompensation, and current references to support both established inductive head and the more recent magneto-resistive (MR) head technologies.

Philips Semiconductors Unveils Analog DFE Family of Read Channel ... by Business Wire

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