Western Digital Technologies, Inc.

Caesar Cheuk-Chow Cheung

Haining Liu

Subhash Balakrishna Pillai

Jeerun Chan

Daniel Lee Ellis

Thomas Patrick Anderson

Michael Harvill

The subject technology provides for recovering a validity table for a data storage system. A set of logical addresses in a mapping table is partitioned into subsets of logical addresses. Each of the subsets of logical addresses is assigned to respective processor cores in the data storage system. Each of the processor cores is configured to check each logical address of the assigned subset of logical addresses in the mapping table for a valid physical address mapped to the logical address, for each valid physical address mapped to a logical address of the assigned subset of logical addresses, increment a validity count in a local validity table associated with a blockset of the non-volatile memory corresponding to the valid physical address, and update validity counts in a global validity table associated with respective blocksets of the non-volatile memory with the validity counts in the local validity table.

Recovery of validity data for a data storage system

A method includes receiving, at an interface of a storage device and from a host device, an electrical signal representative of data. The storage device includes a mass storage device. The method also includes splitting, at the interface, the electrical signal representative of the data into a first data stream and a second data stream, wherein the first data stream is identical to the second data stream. The method also includes sending, from the interface and to a controller of the storage device, the first data stream; and sending, from the interface and to an analyzer integrated within the storage device, the second data stream. The method further includes filtering, by the analyzer, the second data stream to generate debugging data; and sending, by the analyzer and to the host device, at least a portion of the debugging data.

Embedding analyzer functionality in storage devices

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Irvine, CA, United States of America

Caesar Cheuk-Chow Cheung