This Hub clean design supports two hard drives without problems My Passport Ultra 2.5 "2TB when connected to a Mac Book Pro last generation a success :) I recommend to all those who find two USB on a MBP is a bit tight. It would be five stars if the cable was more flexible: the supplied cable is very stiff and keeps the folds made on packaging. Suddenly, the Hub does not leave the choice of its place, it is unsightly and inconvenient. A softer cable would be a real plus.