Seagate Technology Incorporated

HengChang Guo

ChoonHoe Koh

KianKeong Ooi

BengWee Quak

KianSoon Yeo

JiaHong Shu

YuNang Zai

Kong Yaw Lucas Lee

WaiKhay Chan

A motion pattern of an actuator supporting a head is monitored during/after a disc spin-up. The monitor's signal is configured to generate a digital indication of where the head was just before the spin-up. The digital indication is optionally a single-bit indicator that is used directly as a decision of whether to continue a start-up operation.

Sensing a prior transducer position by a motion pattern

Method and apparatus for moving a control object, such as a data transducing head in a data storage device, from an initial position to a destination position. A base generation term describes a normalized trajectory (acceleration, velocity, displacement) of the control object away from the initial position and toward the destination position. A control profile is determined in relation to the base generation term as well as in relation to an acceleration distance and an acceleration time, respectively characterized as a displacement distance and an elapsed time during which the control object is accelerated. The control object is then moved in relation to the control profile. The base generation term is preferably stored in a table which is accessed and scaled in relation to the displacement distance (seek length) for the control object.

Control object positioning using jerk, current and time optimized control profiles

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Singapore, Singapore

HengChang Guo