Its a secondary drive, for storage, and seems to work just fine until not accessed for a certain amount of time. That time period is approx 5 minutes. It goes from quiet, to a scratchy, repetitive sound that sounds like an amplified disk access sound.
Is this a HDD idle function that lays the heads in a bad sector and its making that sound?
the link in the pinned section of internal hardware that lists hard drive sounds, is a bad link, so I am posting this here.
I have used the Utility for WD HDD's(Western Digital Data Lifeguard Diagnostics for windows - DLGDIAG) but it seems I can not use it on the WD drive while my computer is running. It says please make sure you close any programs from the G: drive to prevent data loss, I hit OK, then ran the quick test, and these were the results after 5 seconds:
Test Option: QUICK TEST
Model Number: WDC WD1001FALS-00J7B0
Unit Serial Number: WD-WMATV7845409
Firmware Number: 05.00K05
Capacity: 1000.20 GB
SMART Status: PASS
Test Result: FAIL
Test Error Code: 06-Quick Test on drive 2 did not complete! Status code = 07 (Failed read test element), Failure Checkpoint = 97 (Unknown Test) SMART self-test did not complete on drive 2!
Test Time: 12:54:51, July 31, 2011