Dell Axim x50v recognize Compact Flash card file change in funny way

I recently brought a 2Gb Compact Flash card, and start to put piles of junk in the card (hey, that's the whole reason for buying the card in the first place :-> ). I realize that somehow after I add files in the CD card and insert into the card, all problems failed to recognize the changes. That is until I open any file in the CF card using any application, then the PPC recognize the changes. I can force the PPC to recognize the changes by soft reset, but that's what something I don't want to do.