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: Dell Latitude E7440, i5, 1080p screen, Crucial 8GB, Crucial M500 480GB mSATA, Win7
NAS&Downloader: XPEnology PC, AMD E2-2000, 4GB, 2x Seagate 4TB ST4000DM000, 2x HGST NAS 4TB, DSM 5.0
HTPC1: TranquilPC ABEL H2, i3, 4GB DDR3L-12800, Crucial M4 128GB mSATA, Win7
HTPC2: Akasa Euler, DH61AG, Pentium G620, 4GB DDR3L-10666, Crucial M4 64GB mSATA, Win7