As a matter of interest, because it has two SD card slots can I put two different card sizes/speeds in? I have at the moment (from my D90) a 32 GB Sandisk Extreme 45 MB/s. Can I put another 32GB card in with a different speed? A 32 GB Sandisk Ultra 80MB/s as an example. I have searched everywhere on the net to no avail, so I come to the best forum in the universe to find the answer.