Abstract
Noise properties of perpendicular magnetic recording were investigated for some PR channels; PR4, EPR4 and E^2PR4 by computer simulation. A measured readback pulse and a real noise spectrum were used as well as an arctangent pulse and a white noise, which is mathematically easy to adapt. Results for the measured signal and noise were relatively different from that for the arctangent signal and the white noise. Noise correlation after PR equalization was also discussed. And considering this noise correlation, we thought a detection based on regression analysis was good, and analized it.
