If you are having the same problem on the Aura, maybe look at that particular SD card not working yet with the FW or perhaps being somehow crapped out. It may be that you can use your 32 Gig SanDisk in the future, but for now, maybe try one of the ones I have working on all of my devices. I have a SanDisk 4 Gig, class 4 and an Adata 16 GiG, class 10.
Remember my busted cat cable?--still could be

.