hey that casio is clever!. they use the camera on the device to capture what you have written on the paper other side. one page can be captured when closing the portfolio OR you can prop it in landscape mode and it will capture each page separately as you turn the pages.
another idea would be to put a 10" boogie board rip on the other side. the RIP can save pages
http://www.improvelectronics.com/us/...ng-tablet.html so instead of having it save to a card you could have it save to the tablet
then you save each page before you clear it for the page "turn"
of course with paper you can turn back a page and re read something. with the boogie board once its cleared it s gone so you'd have to go to the tablet which wouldn't be an issue if everything was tagged nicely as it was saved.
of course it might just as cost effective and less complicated to get the 10" Galaxy Note