METHOD AND APPARATUS FOR PREPROCESSING LOW FREQUENCIES IN PERPENDICULAR RECORDING

摘要

A method (210) of preprocessing low frequency components of a perpendicular read-back signal in a data storage system in order to reduce low frequency noise includes introducing (215) a dominant known perturbation, to the perpendicular read-back signal, which masks the effects of other low frequency noise sources and leaves the read-back signal with one dominant low frequency noise component. The method then further includes removing (220) the dominant known perturbation from the read-back signal to recover low frequency portions of the read-back signal in order to determine values of bits read from a storage medium. A perpendicular recording data storage system (100) configured to implement the method (210) is also disclosed.