Abstract

Magnetic field modulation recording (MFM) on a magneto-optical (MO) disk has the advantage of being able to write shorter marks corresponding to higher linear recording density. We reported on an approach to increasing the recording density in an MO disk by improving the signal to noise-ratio (SNR) and optimizing the conventional media structure[1]. The conventional edge detection method combined with a run-length limited (RLL) code has the limitation of detecting recorded bits at linear densities where the minimum carrier level is small because of increasing intersymbol interference (ISI). The partial-response maximum-likelihood (PRML) detection method is well known for being efficient especially for channels that suffers severe ISI but has good linearity.

© 1996 Optical Society of America