The couple of recent posts above reminded me of my musings about size/speed limits for microsd in US1300 and my [Only registered and activated users can see links. ] to get Giomen to 'fess up whether he had bought and tried a 64GB card in his 3xxx's. I can confirm that a Sandisk 32GB Class 4 runs as nicely as my RiDATA 16GB Class 10, however, having been unable to get the Asp outta Gioman's pocket, i've sprung about $70 for a Sandisk 64GB microSDXC (Class 6) but i am saddened to find that it won't work in my 1300 even with only a single small map on it. Curiously, it shows up in the diagnostics menu with the CID and correct size indicated. Maybe with future fw upgrades for the 1xxx series it will work...... Anyone tried one with newer devices like 2xxx, 3xxx or even maybe 30/40/50?