My siblings have one 13" 2013 rMacpook Pro and one 15" 2012 rMacbook Pro and both their external USB 3.0 drives eject themselves. They live abroad so I can't get my hands on the Macs to help them. The 13" has an Express 2.5" USB 3.0 Hard Drive Enclosure from OWC, and the 15" has a brand new HGST Touro Mobile Pro 1TB. I see form other threads that many people have the same issue with other USB 3.0 drives. Can the issue be fixed? Can someone recommend a 7200rpm external USB 3.0 HD that works flawlessly with these two rMacbook Pros?