Beware. I thought I had ordered the Anker 1C3A (3-Port 1 out). Turns out this hub is not trustworthy when attaching 4 or even 3 external drives simultaneously. I managed to get 3 attached and working by introducing each one by one, otherwise they either froze, couldn't be ejected or unmounted improperly, potentially causing damage to my external drives. Attaching a 4th is impossible without certain damage. I even called Anker before using this A8309 Hub as it looks and feels very flimsy and cheaply made compared to the Anker 1C3A I mentioned above. Anker told me not to worry they'd perform just fine. I feel fortunate it did not damage either of the 4 drives I connected. I bought two of these and they'll both be going back to Anker. That is all.