I can't get any 4GB card to work to full capacity in the Reader. They all choke when they get more than 2GB of data on them, books or audio makes no difference.
I have tried 2 different Transcend 4GB (150x) SD cards and one SanDisk 4GB Memory Stick Pro.
But I hadn't thought to check how they are formatted -- perhaps today I'll try to format them as FAT instead of FAT32.
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