Hello, Hope someone can help with the following problem: I recently bought the CalDigit Thunderbolt Station that I have hooked up to my mid-2011 iMac 21,5". I have also bought an Icybox external USB 3.0 enclosure with a Samsung SSD 840 drive installed. My hope/goal was to use the SSD drive as a boot disk for my iMac, using USB 3.0 from the Thunderbolt Station. However, when the USB disk is connected to the Thunderbolt station it is not recognized at boot, and it does not show up in the startup manager. It does mount up normally in Finder as an external USB 3.0 drive. When connected directly to the iMac, using its USB 2.0 ports, it works fine as a startup disk. Any clues to how to get the drive to work as a status disk using the USB 3.0 interface? Is this related to the firmware of the iMac, or could it be something do do with the external drive and incompatible USB controller? Any help is greatly appreciated, thanks!