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.
Gamer: Define XL R2, Asus SABERTOOTH 990FX, FX8320@4.4GHz, Asus HD6970, 8GB DDR3-1866, M4 256GB, Win7
NAS: Define Mini, Asus P8Z77-M PRO, i3-3225, 16GB DDR3-1600, 128GB PM830, 2x1TB & 2x4TB Seagates, Server2012
HTPC1: Intel NUC i3, 4GB, M4 64GB mSATA, Win7 (Tranquil case soon)
HTPC2: Akasa Cypher, DH61AG, Pentium G620, M4 32GB mSATA, Win7