Oops looks like the Constellation and RE4 2TB are in use.
3TB Western Digital Green - 3TB WD30EZRX
2TB Western Digital Green - WD20EARS 2.0TB
2TB Seagate Barracuda Green - ST000DL003
Enterprise :
1TB HP 1000nm0033 in a HP smart caddy (Rebranded Seagate Constellation) 0
500GB Western Digital RE4
300GB Western Digtal VelociRaptor WD3000HLFS (2x, 1 with heatsink, 1 without)
I really need to start getting rid of drives.