I've been trying for about a week now to partition my 32GB SD Card so 4GB can be used as a Ubuntu Live and the rest as general storage that can be seen by Ubuntu and Windows.
I've tried this method: http://www.pendrivelinux.com/create-a-larger-than-4gb-casper-partition/ Everything works up until the Start Disk Creator. My partitions are not visible there even though they are visible on my computer.
Also I've attempted with VM Player http://www.howtogeek.com/97177/how-to-put-ubuntu-linux-on-a-usb-thumb-drive-without-the-mess/
If this helps, here is the SD card I'm using with the USB adapter. http://www.adorama.com/KGMB10G232GB.html?utm_term=Other&utm_medium=Shopping%20Site&utm_campaign=Other&utm_source=gbase