Seagate Technology Incorporated

KayHee Tang

UttHeng Kan

Edmun ChianSong Seng

CheeHou Peng

PohGuat Bay

HaiBo Ye

Xiong Liu

Wenxiang Xie

ChoonKiat Lim

Harry Tiotantra

Ajay Narayan Kulkarni

AikChuan Lim

Aik Chuan Lim

Chee Hou Peng

A data storage device can have one or more rotating data media with data tracks that are radially disposed from a central spindle. The data tracks may be logically divided into multiple regions while a write strategy is generated with a region module to set a sequence of different regions for future data writes. Receipt of a data write request to the data storage media from a host can prompt the region module to classify the data write request as a sequential or random write in order to intelligently select a region to satisfy the data write request based on the write strategy to maximize data writing consistency for data associated with the data write request.

Intelligent region utilization in a data storage device

Implementations disclosed herein include a method comprising detecting a workload request from a host, estimating a media cache fill-up rate based on the detected workload request, estimating a current media cache usage, predicting, based on the detected workload request, the estimated media cache fill-up rate and the estimated current media cache usage, a workload profile, and determining a preemptive media cache cleaning strategy based on the predicted workload profile.

Workload detection and media cache management

An apparatus and method of predicting functional capability of a data storage device having a plurality of information tracks, comprising performing a DC erase on three adjacent information tracks, writing a predetermined bit pattern on a middle track of the three adjacent information tracks, providing a first signal from the bit pattern to a variable gain amplifier to generate a first value of the variable gain amplifier, performing DC erases on the information tracks adjacent the middle track, reading the bit pattern from the middle track to provide a second signal to the variable gain amplifier to generate a second value of the variable gain amplifier, and operating on the first and second values of the variable gain amplifier to provide a track mis-registration value for use with a predetermined threshold value to determine the functional capability of the data storage device.

Track mis-registration measurement for a disc drive

A method and data storage device determine an equalized signal-to-noise ratio in the storage device. The equalized signal-to-noise ratio is determined by generating an analog read signal, passing the read signal through an equalizer in the storage device, and sampling the equalized signal using an analog-to-digital converter in the storage device. The samples from the analog-to-digital converter are then used in the equalized signal-to-noise calculation.

Method and apparatus for determining equalized signal-to-noise ratio in a storage device

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Singapore, Singapore

KayHee Tang