Ask Dell if that card size is supported or if you need an OS update.
I ran into both issues a few months back. One person had a bum card, the other had a 1G card that was over the maximum size supported on the OS they had.
How do i add a storage card to a PDA. I have a Dell Axim 30 with a 425 intel xscale processor. I inserted a 512mb sandisk SD card into the slot. It does not show anywhere in the system. the Storage card tab in the system is greyed out. Please help.