quick format your 1tb drive is all thats needed to prep your storage drive,
the drive you use to flash the box has to be prepared properly or the box will simply ignore the usb & boot as normal, 2gb or 4 gb pen drives are perfect for flashing as they dont take long to prepare, larger drives could be used but they can take hours to prep so smaller is better for flashing.
prep drive ready to flash: low level format with hddguru followed by a full fat32 format with Windows.... now its ready to load an image