I could be wrong, but I think none of the stable ports take SD cards. Only microSD cards. There are SD to microSD adapters, so you can use a SD card on these players too. But it depends on how you use the card. If it is formatted to FAT32 and also changed the partition type to Fat32 a Cowon D2 should work fine with it. iPods and iFlash adapters with SD cards are known to cause problems.