I would also try using a smaller gb card...I have a Pro duo and a micro SD and I've never had a problem with either of them. They are both only 2 gb, but I back-up my books and then re-back them up (I'm paranoid, what can i say?). One is a SanDisk (pro duo) and the other is PNY. I like the SanDisk better, but they both work fine.
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