PaulS:
The SD library handles files in the 8.3 format. 8 + 1 + 3 + 1 = 13. Changing the array size to 40 or 400 won't change that fact that 8 + 1 + 3 + 1 is 13.
and i can i modify the library so as it can supports ling files names? or i should use another library?