Are these name brand cards purchased from legitimate dealers? There are many counterfeit cards out there that are branded as SanDisk as well as others. A while ago Best Buy had acknowledged they unknowingly wound up with counterfeits from some suppliers.
Have you tried the cards in a reader or in another Treo to see if they are recognized? Also, have they been formatted on the Treo or in a PC reader?
I also wonder if there may be a problem reading the newer super fast cards. Maybe the Treo can't use the extra fast features.
SteveTaz
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