Western Digital Technologies, Inc.

Ammar A Zayed

Chun Sei Tsai

Bernd Lamberts

Remmelt Pit

Carl E Barlow

Dean V Dang

Thao Hieu Banh

Chirag C Patel

Abhishek Srivastava

Karthik Venkatesh

A data storage device is disclosed comprising a non-volatile storage medium (NVSM) having a plurality of data sectors and a plurality of reserve sectors. A map-out value is generated for each of a first plurality of the data sectors based on a read latency of each of the first plurality of data sectors, and when the map-out value of a first data sector in the first plurality of data sectors exceeds a threshold, a first logical block address (LBA) is mapped from the first data sector to a first reserve sector. When the map-out value of a second data sector in the first plurality of data sectors exceeds the map-out value of the first data sector, the first LBA is mapped from the first reserve sector back to the first data sector, and a second LBA is mapped from the second data sector to the first reserve sector.

Data storage device dynamically relocating data sectors based on map-out value

A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of tracks. A defect scan of at least one of the tracks is executed, and a log entry is generated when a defect is detected. After the defect scan, a verify operation is executed for at least two of the detected defects. A number of times the verify operation detects a false defect is counted, and whether the head is defective is determined based at least partly on the count.

Data storage device screening heads by verifying defects after defect scan

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Foothill Ranch, CA, United States of America

Ammar A Zayed