Seagate Technology Incorporated

WaiKhay Chan

KianKeong Ooi

BengWee Quak

KianSoon Yeo

JiaHong Shu

Kong Yaw Lucas Lee

YuNang Zai

ChoonHoe Koh

HengChang Guo

LiangSin Siew

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

A servo test is performed on a disc drive. The servo test includes performing a position error sample (PES) threshold test on tracks in the disc drive and identifying those tracks that fail the PES servo sample test. Zero acceleration path (ZAP) learning is performed on the identified tracks, and is performed on less than all of the tracks on the disc drive. Another PES servo threshold test is performed on the identified tracks to determine whether they pass the servo test, given the ZAP learning process.

Servo test method

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Singapore, Singapore

WaiKhay Chan