Does anyone know if there are any restrictions on the type or capacity of USB memory sticks that are compatible with the Tenma range of DSO's? I have noticed in the manual for the Tenma 72-8710 100MHz DSO that they mention using only recommended memory sticks but there is no further mention of any details. Has anyone used a USB memory stick in any Tenma DSO, in particular the 72-8710 and has anyone experienced any problems with certain makes or capacities? Many thanks.