Hi, Bought a new external hard-drive, 2tb WD, which is connected via FW800 enclosure. Backed up about 1.5tb of data onto it. I noticed that every now & then, the drive keeps "ticking" even though I am NOT accessing it: About 4 ticks a second. Every few seconds that's followed by a higher-frequency ticking. Overall, it doesn't sound repetitive to me i.e. not like your usual bad sector with a read & write error... At first, I thought it might be the system accessing the drive in the background (indexing from Spotlight, calculating file size,...). But this morning, I turned the drive on with NO data cable connected whatsoever. And the ticking sound is still there!?!? Drive is connected via a Freecom SATA reader/bay. Drive info says "Initio INIC-1615P" (whatever that means), but it's a WD Caviar Green. Did a 30-minute integrity check with Drive Genius, and it seems OK. Should I be concerned about that ticking sound & replace the drive? Or just get on with things as long as the drive doesn't slow down?