Why the card reader cannot detect or slot-in with the MS Pro Duo/ RS MMC card?
First of all, please check with the card is inserted with the right direction, most of the card cannot insert with the reverse side. On the other hand, the new MS Pro Duo or RS MMC card, most of them must compiled with the adapter before insert into the card reader. Should you have any question about the memory card, please contact with the memory card supplier.