Tiny7 not booting of a usb 3.0 drive

i have problem. I installed Tiny7 (A very minimalized version of windows 7) on a usb 3.0 drive.First i booted it up on a dell latitude e6420. After i switched to a dell latitude e6430. If i try to boot to it, during the windows 7 boot animation i get a BSOD (blue screen of death). the error code is 0x0000007b witch means Inaccessible Boot Device.Can i get some suggestions that would help me?enter image description here