IntroductionPerpendiciilar magnetic recording attrx1.s much attention as the efficient recording system to achieve higher-density recording. The signal processing techniques such as the partial response inaximuni likelihood (PRMI.) ilystems are indispensahle for high density perpendicular magnetic recording as well as longitudinal recording. The P'KML systems characterized by the polynomials with the only positive Coefficients h a w been proposed for a perpendicular niagnetic recording channel using a double-layered medium with additive \vhit,e Gaussian noise (AU'GN) [I]. In present talk, the required SNR L o achieve a bit error rate (BER) of for those PRML systems is st,irdied in the read/write channel involving both jitter-like noise such as t.he transition noise and AWGN.

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