Structure and adjustment of a novel write-precompensation scheme

At high data rates and information densities, recorded data patterns in dig ital magnetic recording systems can exhibit severe nonlinearities. Key caus es for these nonlinearities are bandwidth limitations of the write path and demagnetizing fields in the recording medium. The present note reviews the structure of these nonlinearities, develops a simple yet generic write-pre compensation scheme that is capable of counteracting them, and derives a te chnique for adjusting this scheme according to information extracted within the data receiver.