Patent · US Active

Data storage device screening heads by verifying defects after defect scan

US9117489B1 · kind B1 · utility

2Cited by

448References

16Claims

0Family size

Assignee

Western Digital Technologies, Inc. · US

Inventors

Dean V. Dang · Willow View Lane, US
Chun Sei Tsai · Tustin, US
Chirag C. Patel · Rancho Santa Margarita, US
Ammar A. Zayed · Lake Forest, US
Carl E. Barlow · Lake Forest, US
Thao Hieu Banh · Lake Forest, US

Key dates

Filing date	Feb 18, 2014
Grant date	Aug 25, 2015
Priority date	—
Expiry date	Feb 18, 2034

Classification

Technology area (CPC G)Physics
CPC primaryG11B2220/20
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.