This BLINK compiles 129,948 bytes. You have to have SdFat lib there.
Not for running, just for compile and 1284p upload test..
Remove your SDCARD when playing with it..
No warranties of any kind. Use at your own risk.. 
Binary sketch size: 129,948 bytes (of a 130,048 byte maximum)
Blink_129048bytes.zip (107 KB)