Freeware: WD Support / Downloads / SATA & SAS / WD Caviar Blue / SE / SE16 (SATA II)

http://support.wdc.com/product/download.asp?groupid=606&sid=3〈=en

Data Lifeguard Diagnostic for Windows

This is a Windows version of the Data LifeGuard Diagnostics. It will test WD internal and external drives. In additional, it can provide you with the model and serial of WD drives attached to the system.