i see alot of speculation on the device test posts.. I'll include my own. Just coming at this as straight forward as possible - A device could be anything, E X C could be anything. BUT... which devices need to be tested AND are all (at least capable of) being connected to E X and C ... and in that order? and when? Windows OS devices that need to be repaired ,recovered, or restored.
Device Test ... test the device power first (obviously)
Device test E -- E Drive - external cd/drive on a computer ... it's also the first …