I have been looking at ext2 a bit since an apparent loss of directory entries. My partition is 230G big so I have 2384 groups and a block size of 4096 bytes. What puzzles me is that, between the group descriptors and the data block bitmap I seem to have an enormous structure about which I cannot spot any mention in the apparent documentation. This structure is 400000H bytes big (4,194,304 bytes decimal), and seems to have a systematic pattern of a few bytes every 4096 bytes. Could anybody please tell me what this structure is? TIA