Generalized Partial Response Targets for Perpendicular Recording with Jitter Noise

–In this paper, we propose new generalized partial response (GPR) targets for perpendicular recording whose transition response is modeled as an error function, and compare their performance with the partial response (PR) targets both in the presence and in the absence of jitter noise. Regardless of any jitter noise amount, results indicate that the GPR targets outperform the PR targets, especially at high linear recording densities. We also determine that the dominant error sequence for this perpendicular recording is the same for all targets when jitter noise is low. The system performance can therefore be further improved by designing and using codes to avoid this dominant error sequence. Another signiÞcant point is the fact that the dominant error sequence of perpendicular recording is different from longitudinal recording, thus requiring design of different types of codes than the ones used for longitudinal recording. Finally, we show that the effective signal-to-noise ratio (SNR) can be equivalently used instead of the bit-error-rate (BER) as a measure to compare the performance of different targets. Keywords–Error events, generalized partial response targets, jitter noise, perpendicular recording.