I have seven WD My Book USB 3.0 drives that I'm pretty happy with. Had to send one back, but WD replaced my 3TB with a 4TB pretty quickly. I just bought the last one a few weeks ago, and WD is finally providing a utility to turn off the dreaded "green" power-saving mode. Best of all, Staples carries them and they occasionally run a 20% off in-store promotion that makes them very affordable.