I have the Q572 with only a 64GB M-Sata SSD. It appears that it could take a 256GB or maybe more according to some sites. How do I get the back off the tablet? The 4 Phillips screws are no problem but there is obviously something else to release. Is it something to do with the other 4 screwed holes covered with a small plastic cap? Fujitsu weren't very helpful stating that they didn't have instructions "for the public"!!! Anyone done this? What is the max SSD it will really take. All ideas welcome.