It’s a usb 3.0 2-bay raid enclosure in JBOD mode. Windows 7 64 bit won’t boot with it connected unless I press the F8 key and select the option to ignore unsigned drivers. Then it boots but won’t mount in Windows. No such problem under Windows 7 32bit on bootcamp on ‘09 Mac mini. Difference is usb 2.0 vs 3.0 and WIN7 32 bit vs 64 bit. It seems to be a problem with bootcamp usb 3.0 driver or the WIN7 usb SATA bridge driver that gets installed for the enclosure by Windows (no special drivers supplied by manufacturer).