I can't copy or move the file the normal way, but If I need to switch a memory card, then I've got problems...
Nintendo is getting paranoid about us cheating, they need to just relax. in this case, the trouble it would take to copy data, trade from one card to GBA, then from GBA to the other card takes more work than it's worth anyway (In most cases) but they disabled it anyway, meaning that if we have a problem with memory cards, we screwed.