My Treo 650 (Palm OS 5.4) don't recognize any SD card.
2 Cards (1 and 2 GB) were tested and formated in a digital camera (FAT) and they work fine.
Looking with FileZ to files that are in the ROM, I found:
-FATFS-49k -MMSDCard-16k -MMSCard_esES-6.3k
-MMVCard Plugin-27K --MMVCard Plugin_esES-27K
Can it be a software problem or it is a hardware?
Changing FATFS to FAT32 can solve the problem?