I currently have a 2012 iMac of which I run OSX on a thunderbolt SSD drive and Windows on the internal HDD Drive. As Windows is running on the HDD its slower to boot and I have found no way of having OSX and Windows running on the Thunderbolt drive together (plus I don't want to comprise on space on the Thunderbolt SSD). So I was thinking of getting an External USB 3 SSD drive to run Windows 10 on. Would this work? So what I'm asking is, is it possible to run OSX on a thunderbolt SSD and Windows 10 on a USB3 SSD Drive?