Installed this into a NAS; a-ok except wow this drive is noisy. It's installed in the NAS in a closet, yet I can hear it chattering away from clear down the hallway in another room. I have a WD WD80EFAX in the same NAS and the WD is nowhere near as loud.
It also runs a little warmer than the 4GB drives it replaces (e.g. 37 vs 31 C) but not as much as the WD80EFAX at 41C.