+.I \-n
+Disables metadata checksum verification. This should only be used if
+you believe the metadata to be correct despite the complaints of
+e2fsprogs.
+.TP
+.I \-c
+Specifies that the file system should be opened in catastrophic mode, in
+which the inode and group bitmaps are not read initially. This can be
+useful for filesystems with significant corruption, but because of this,
+catastrophic mode forces the filesystem to be opened read-only.
+.TP
+.I \-i
+Specifies that
+.I device
+represents an ext2 image file created by the
+.B e2image
+program. Since the ext2 image file only contains the superblock, block
+group descriptor, block and inode allocation bitmaps, and
+the inode table, many
+.B debugfs
+commands will not function properly.
+.B Warning:
+no safety checks are in place, and
+.B debugfs
+may fail in interesting ways if commands such as
+.IR ls ", " dump ", "
+etc. are tried without specifying the
+.I data_source_device
+using the
+.I \-d
+option.
+.B debugfs
+is a debugging tool. It has rough edges!
+.TP
+.I -d data_source_device
+Used with the
+.I \-i
+option, specifies that
+.I data_source_device
+should be used when reading blocks not found in the ext2 image file.
+This includes data, directory, and indirect blocks.
+.TP
+.I -b blocksize
+Forces the use of the given block size (in bytes) for the file system,
+rather than detecting the correct block size automatically. (This
+option is rarely needed; it is used primarily when the file system is
+extremely badly damaged/corrupted.)
+.TP
+.I -s superblock
+Causes the file system superblock to be read from the given block
+number, instead of using the primary superblock (located at an offset of
+1024 bytes from the beginning of the filesystem). If you specify the
+.I -s
+option, you must also provide the blocksize of the filesystem via the
+.I -b
+option. (This
+option is rarely needed; it is used primarily when the file system is
+extremely badly damaged/corrupted.)
+.TP