I tried formatting the Sandisk Extreme Pro 170, 128GB card which doesn't work @240 with the Mac,but sadly, it still doesn't work.
The card which doesn't work is more recent than the one that does. Maybe it is a firmware revision thing?
Is there a tool I could use to display the SD Card's info.? This would help us find compatible cards.
Working Card serial begins with 213
Non-Working Card serial begins with 221