Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8G4 Safari/6533.18.5)
Both are 5400rpm - It's probably mostly because you went from 2 platters to 3 (among other factors)
Edit: your 1TB also has a 12ms response time - I think most laptop hard drives are half that. You bought one of the earliest 1tb drives, I wouldn't be be surprised of it's a bit slow.