Bit Shift Characteristics in High Density Magneto Optical Recording

A crucial factor in high density digital recording in magnetooptical disks is to reduce bit errors caused by bit shifting. Factors affecting bit shift include imperfections in the recorded pit and noise caused by residual signals after erasing, as well as intrinsic media noise and noise inherent in the detection process. Imperfections occur when write power varies or when reflectivity or magnetization fluctuates or varies randomly. Noise caused by residual signals after erasing occurs when the erase power or erase magnetic field is insufficient. This paper investigates the relationship between bit shift and write/erase laser power or erase magnetic field in an attempt to realize high density digital recording.