Abstract: A read channel is described for use in a storage device including a storage medium for storing data, an interactive element for reading information from and writing information on the storage medium and a processor for performing control functions in the storage device. The read channel comprises a set of electronic components for receiving and processing information read by the interactive element from the storage medium. Each component of the set of electronic components includes an output and is coupled in a predetermined arrangement to other components of the set of electronic components. A data capture circuit includes an input circuit and an output circuit with the input circuit being coupled to the output of each component of the set of electronic components, and the output circuit being coupled to the input circuit to capture a signal from a preselected one of the outputs coupled to the input circuit. The output circuit is adoptable to transfer the acquired signal to the processor.

Abstract: An apparatus for the adaptive cancellation of at least a first pole frequency in a magnetoresistive (MR) head device includes a preamplifier coupled to first and second terminals of the MR head. A signal at a pole frequency produced by the preamplifier is cancelled by a zero boost frequency signal generated as a result of a signal across the MR head read by a differential amplifier. The zero boost frequency signal is passed to the read channel coming from the MR head to cancel the pole.