Western Digital Technologies, Inc.

Raymond Yu

Srinivas Neppalli

Brian Jones

David Christopher Pruett

David M Hamilton

Managing data stored in a Data Storage Device (DSD) including a volatile memory and a non-volatile memory including a circular buffer. Metadata stored in the volatile memory is logically divided into blocks of metadata. At least one changed block of metadata is identified that has changed during operation of the DSD and the at least one changed block of metadata is stored in the circular buffer of the non-volatile memory.

Check-pointing of metadata

A disk drive comprising a rotatable disk, a head actuated over the disk, and a controller is disclosed. The controller is configured to write a first force unit access write data to the cache as part of the cache data, write the first force unit access write data and a first metadata corresponding to the first force unit access write data to the first location by using the head, transmit a first write complete status to a host, and maintain the first force unit access write data in the cache as part of the cache data. The controller is also configured to store write data as part of the cache data. Furthermore, the controller is configured to write the cache data to a third location, and a metadata corresponding to the cache data to the disk.

Method and apparatus for performing force unit access writes on a disk

Managing data objects in a Data Storage Device (DSD) including a disk and a volatile memory for storing data. A data object is written from the volatile memory in a data object zone of the disk of the DSD. At least one most recent version of a previously written data object is rewritten in the data object zone so that an earlier version of the data object written from the volatile memory does not interrupt a contiguous plurality of most recent versions of data objects stored in the data object zone.

Growing community of inventors

Westminster, CA, United States of America

Raymond Yu