I have an old IDE 80gig WD drive in an external encloser, holding various unimportant files. I’ve noticed lately that it has a kind of surging hum or vibration. It’s on a 3-second cycle, just a gentle low-frequency vibration. For a while I thought it was a hum from my PSU until I realized it vanished when the USB encloser was turned off.
It’s still working just fine. I’m just wondering if it’s a bad sign or if it’s just a bit “loose” from many years of service.
It’s a WD80 00B-00FRA0 if you are interested in such things.