So I'm planning to try out your improved DUE SPI / SD card library this weekend on my laser tag system. I'll let you know how it goes. I currently use the ATmega328P with your old SD library, but use file indexing to open files quickly. Not very user friendly for coding, but it works. Maybe I can retire the file indexing if this works much faster?
What is the status on this being implemented into the DUE library non beta?