Seagate Technology Incorporated

JackMing Teng

KianKeong Ooi

MingZhong Ding

BengWee Quak

WingKong Chiang

HuaYuan Chen

Patrick TaiHeng Wong

KianSoon Yeo

JiaHong Shu

CheeSeng Toh

Djunaedy Chandra Ang

BaoHong Liu

A method of handling a write error is provided. A write error is detected during a write operation on at least one data storage segment. A reassignment mode is selected from a plurality of different reassignment modes.

Prediction-based data reassignment

A method, apparatus, and combination for reducing acoustical noise at start-up of a device is disclosed. The method includes the steps of determining an internal temperature of the device, and unlatching an actuator of the device based on the determined internal temperature of the device, by steps for unlatching the actuator of the device. The apparatus includes a thermistor providing a resistance value to a controller that selects an unlatch process based on the resistance value of the thermistor, and an unlatch procedure programmed into the controller executing the selected unlatch process. The device combination includes a base deck supporting an actuator confined by a magnetic latch for periods of inactivity, and unlatched from the magnetic latch for periods of activity by steps for unlatching the actuator.

Acoustical noise reduction for a data storage device

An apparatus and method for writing a product information code (PIC) to a head-disc assembly (HDA) of a disc drive data handling system to facilitate subsequent identification of the HDA. The PIC is configured as a sequence of n multi-bit encoded words. Servo data are written to a disc of the HDA as a number of p angularly spaced apart servo data fields, the servo data used by a servo control circuit to effect head positional control. The n encoded words are distributed across a subset n of the p servo data fields so that the n encoded words replace at least a portion of the servo data in the n servo data fields. Preferably, the n encoded words are written to Gray code (track address) fields of the n servo data fields and are provided with error detection and correction capabilities.

Head-disc assembly with embedded product identification code

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Singapore, Singapore

JackMing Teng