I used a 2gb Sandisk class 2 for awhile. I found that using the memory card seemed to correspond with the Reader being slightly unstable with large ebooks. And the bad part with that was if it reset it would take upwards of a half hour for it to boot. With the card at about 50%. Now I just use the internal memory, which disappoints me as I wanted the whole traveling reference library. I know I can still carry the card on me, but if I just want to look something up, waiting for a half hour would be a pain.
-MJ
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