Sorry , I can't full undrstand your question
I just to explain what I test
1. I test plug-in 2 size sd card into D2 , one is 8GB another one is 16GB
2. both could be detect , no matter I check it at ubuntu or I check it at console (type mount and dmesg) ,both I could found a storage be mounted , and I used it (like copy file into sdcard) also work
3. I check Disk utitlity , I also found it is same as I plug-in sd card to D2 , but I think it not imapct not impact your used case right?
4. I wounder for Disk utility, it is beacuse there are one card reader at D2 plug cause, I also try it at my desktop , used one card reader + 16GB sd-card ,plug-in my computer, I check Disk utility , it just show up onw card reader , not see any 16GB sd card info , so if you just wonder the Disk-utility behavior , I think D2 was same as Desktop