flipped bits

% bdiff /mnt/disk1/large_file /mnt/disk2/same_large_file
diffing: [........................................]
      offset  diff
   346360387: 01011111
            : 01001111
   346360453: 10111010
            : 10111110
   346360515: 11010001
            : 11000001
   346360517: 01001100
            : 01001000