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Test your WD internal and external drives.
Diagnose, benchmark, and monitor hardware of your PC.
Search and extract data about your PC hardware with customized reporting.
Perform overclocking, hardware error diagnosis, stress testing, and sensor monitoring on your system.
Check the health of your storage devices.
Get vehicle diagnostics on your Android phone with the u-scan adapter.
Run diagnostic tests on your CD/DVD drive.
Troubleshoot and correct many common problems that can prevent printing.
Keep your PC running like new, repair, speed up, protect, and optimize your system.
Update: NetDiag, net diagnostic tool