Maxtor Corporation

Roger G Bailey

Michael McNeil

Harlan P Mathews

Lester F Schowe

The present invention relates to circuitry for processing an analog read signal, such as a signal produced by a magnetoresistive head, in a magnetic data storage system. The circuitry processes the analog signal before the signal reaches the detector which converts the analog signal into a digital signal representative of the data originally stored on the magnetic medium. In one embodiment, the invention comprises circuitry for equalizing the amplitudes of the positive and negative pulses in the analog read signal. In another embodiment, the invention comprises circuitry for reducing the baseline shift of the analog read signal. The invention may be used in magnetic data storage systems using any conventional data detection method.

Mr head read signal preconditioning circuitry

MR head read signal preconditioning circuitry for reducing pulse

The magnetic recording system of the present invention relaxes/reduces the magnetic energy in a magnetic recording head at the end of a write operation. In one embodiment, the magnetic recording system (10) includes a magnetic recording media (18), a recording head (14), and a biasing pattern (64) stored along a portion of the media (18). The biasing pattern (64) provides a biasing effect on the head (14) that provides controlled reduction of the magnetic energy domains in the head (14).

Method using a biasing pattern on a magnetic storage media to reduce MR

A clock generator circuit for use with a low power data storage unit includes a resonator circuit for providing a first output frequency resonating at a fundamental frequency of a quartz crystal. A frequency multiplication circuit for multiplies the first output frequency by a predetermined factor to produce a second output frequency greater than the first output frequency. This second output frequency is coupled to the data storage unit and is used during normal read/write mode of operation. In a low power mode of operation, a switching network couples the first output frequency directly to the data storage unit so as to reduce the overall power consumption.

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Longmont, CO, United States of America

Roger G Bailey