How to mark sectors as bad

WD Internal Drives Desktop & Mobile Drives
4

Thanks for your help. The Extended Test Did eventually fail.

Test Option: EXTENDED TEST
Model Number: WDC WD20EARS-00MVWB0
Firmware Number: 50.0AB50
Capacity: 2000.40 GB
SMART Status: PASS
Test Result: FAIL
Test Error Code: 08-Too many bad sectors detected.

Time to see if I’m still under warranty.