On 10/13/2014 11:01 PM, Joerg Lechner wrote: > - stop in Bios mode, switch to Legacy Mode (UEFI mode does not accept my > external F21 pata disk) Is the external disk formatted as GPT with an EFI partition? I installed F20 to a USB stick and it is bootable via EFI. It should be the same for a USB hard drive.