Western Digital Technologies, Inc.

Joo Peng Teh

James N Malina

William Bernard Boyle

Robert Morelli Fallone

Carl E Barlow

Sang Huynh

Joe C Lee

Daniel D Reno

Peng Lee Liang

Glenn Cheng

Muhammad Nur Syukri Ahmad Shukor

Kuang Hwa Teo

Write pointer management for a disk drive including a disk having a plurality of sectors and a non-volatile memory (NVM) for storing data. Data is sequentially written sector by sector on the disk. The data written in a sector includes a write status indicator indicating that data has been written in the sector. A write pointer is stored on the disk or the NVM as a check-pointed write pointer. The write pointer corresponds to a current sector for writing data on the disk. During a write pointer recovery process, the check-pointed write pointer is retrieved, and at least one write status indicator is scanned in a range of sectors from the sector corresponding to the retrieved check-pointed write pointer and a last sector to identify the current sector for writing data. The write pointer is set to correspond to the identified current sector.

Write pointer management for a disk drive

A disk drive is disclosed wherein a plurality of zones are defined on first and second disk surfaces, wherein each zone comprises a plurality of data tracks. Data is written to the data tracks of a first plurality of the zones on the first and second disk surfaces in an interleaved manner, in a first radial direction, and in a shingled manner. Data is written to the data tracks of a second plurality of the zones on the first and second disk surfaces in an interleaved manner, in a second radial direction opposite the first radial direction, and in a shingled manner. At least one guard band is defined at a boundary between a first zone and a second zone in the second plurality of zones on the first disk surface, wherein the guard band comprises at least one unused data track.

Disk drive defining guard bands to support zone sequentiality when butterfly writing shingled data tracks

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Kuala Lumpur, Malaysia

Joo Peng Teh