Abstract
In a hard disk drive (HDD), a postprocessor is used for correcting the random error in a PRML (Partial Response Maximum Likelihood) channel. However, the postprocessor needs an error-detecting code, such as a single parity check code, and the code rate decreases. This paper proposes an erasure correction by Reed-Solomon (RS) code using Squared-Distance-Increase (SDI) instead of a postprocessor. This system does not need any error detecting code. The performance is obtained by computer simulation and is compared with that of the error correction system using a postprocessor. The results show that the proposed system provides an SNR improvement of about 2.6dB compared with the system using a postprocessor in a perpendicular magnetic recording channel with random and burst errors.
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