I searched around the forums and people seem to be having the same problems as I am regarding the SDHC cards but I've tried all the things posted in the forums with no luck.
My Mini 9 has a 16gig SSD
and 2gb of RAM running OSX 10.5.6 at the moment.
I'm using a Kingston 16gig SDHC Card Class 4
I put the card in my camera and it recognized okay, also I formatted it using the camera tools on the camera, not plugged into a computer.
I just installed the DellEFI 1.3b1 Take 3 install today and that didn't solve it either.
I booted into Windows XP (via VMWare Fusion) and it didn't recognize the card either.
I'm pretty much out of ideas at this point. Other than that my Mini 9 has been amazing! Can anyone offer any help?