Well, I am using a Sandisk (ExtremeIII - 2GB) sd card in my CyBook (with 512 MB internal memory) so it's not only Kingston. As I don't have any books on the card (yet) I'll go ahead and try it without a card inserted for a few days (had the lockup about 5 times now - always with sd card in and always resolved by a reset without removing the card)
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