I've got a ST3000DM001 - it vibrates quite a bit. It's a lot louder than the older Barracuda XT 3TB (ST33000651AS).
Both were ripped out of retail boxed Seagate Expansion external drives (the older XT out of an Expansion 2.0, the newer DM001 out of an Expansion 3.0). Very cheap way of getting drives, and you can RMA the drives using the serial on the mechanism. The only thing to note is the firmware can be different to bare drives, but I've never had an issue with that.
Workstation: Ximatec Asgard, i5-3570S, Arctic i30, 16GB DDR3L-12800, Asus HD7850, 256GB Crucial M4, no case fans
NAS&Downloader: Asustor AS-202T, 2x Seagate 4TB ST4000DM000
HTPC1: Asus Essentio, i3-3220T, 8GB DDR3L-12800, 250GB Samsung 840, Windows 8.1 Enterprise
HTPC2: Akasa Cypher, DH61AG, Pentium G620, 4GB DDR3L-10666, Crucial M4 32GB mSATA, Win7