Please select the proper driver for you Pocket PC
according to the list below:

Acer n30 Pocket PC (SDGPS4bit.exe)
Dell Axim X3 Pocket PC (SDGPS1bit.exe)
Dell Axim X30 Pocket PC (SDGPS4bit.exe)

HP iPAQ h1930 series Pocket PC (SDGPS4bit.exe)
HP iPAQ h1940 series Pocket PC (SDGPS4bit.exe)

HP iPAQ h2210 series Pocket PC (SDGPS4bit.exe) 
*you may need to update some program before you use SDIO device 
(http://h18007.www1.hp.com/support/files/HandheldiPAQ/us/locate/105_5721.html)

HP iPAQ h3970 series Pocket PC (SDGPS4bit.exe)
HP iPAQ h4150 series Pocket PC (SDGPS4bit.exe)
HP iPAQ h5550 series Pocket PC (SDGPS4bit.exe)