Seagate Technology Incorporated

Conner Peripherals, Inc.

Fred R Hansen

Me Van Le

Charles R Nielsen

Charles A Bates

Matthew W Rooke

Eugene K Lew

Paul T Petersen

An actuator in a disc drive is controlled to position a transducer over a target track on a disc surface. Movement of the actuator is initiated so the transducer begins moving toward the target track. The actuator is decelerated, as the transducer approaches the target track, according to a deceleration curve which is varied based on drive characteristics.

Disc drive positioning system with variable deceleration curve

A write drive logic circuit is described. The write driver logic circuit comprises a set of write drivers, with each one of the set of write drivers having an input and an output, such that each write driver is responsive to an input signal applied to the input to provide a write output signal at the output as a function of the input signal. A set of memory devices (e.g. shift registers) is provided, one for each write driver. Each one of the shift registers stores unique head identification information and includes an output to controllably output a signal representative of the unique head identification information. Furthermore, each one of a set of multiplexers includes an output, a first input coupled to a corresponding one of the outputs of the set of shift registers to receive the signal representative of the unique identification information stored in the respective shift register and a second input coupled to a common write data line that transmits a signal representative of preselected information. The output of each one of the set of multiplexers is coupled to the input of a corresponding one of the set of write drivers such that one of the first and second inputs of the multiplexer is selectively applied to the input of the corresponding write driver.

Single channel, multiple head servo writing with embedded head

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Newark, CA, United States of America

Fred R Hansen