diskgenius let me resize (actually I had to bakup recreate and restore on bigger space). "Add or remove quicker" what the hell do you have in mind ? this looks like a very useless and dangerous idea. Also ... what the hell were the two other answers ??
It also depends on if you're using a filesystem capable of compression. If you are, you can use a smaller card and still hold a lot of data. It's like putting your entire filesystem in one big zip file.