dumpe2fs
ext2/ext3/ext4 filesystem information dumper
TLDR
Display filesystem information
$ sudo dumpe2fs /dev/sdXN
Display bad blocks only$ sudo dumpe2fs -b /dev/sdXN
Force display with unrecognized features$ sudo dumpe2fs -f /dev/sdXN
Display superblock info only$ sudo dumpe2fs -h /dev/sdXN
Display block numbers in hexadecimal$ sudo dumpe2fs -x /dev/sdXN
SYNOPSIS
dumpe2fs [-bfghixV] [-o superblock=superblock] [-o blocksize=blocksize] device
DESCRIPTION
dumpe2fs prints the superblock and block group information for ext2, ext3, and ext4 filesystems. It displays detailed filesystem metadata including features, block counts, and allocation information.
PARAMETERS
-b
Print only the blocks marked as bad-f
Force display even with unrecognized feature flags-g
Display block group descriptor information in colon-separated format-h
Display superblock info only, not block group details-i
Display filesystem data from image file-o superblock=NUM
Use alternative superblock at block NUM-o blocksize=SIZE
Specify block size when searching for superblock-x
Display block numbers in hexadecimal format-V
Display version information
CAVEATS
For best results, unmount the filesystem before running dumpe2fs. Some information may be stale on mounted filesystems.
HISTORY
dumpe2fs is part of e2fsprogs, providing diagnostic information about ext2/3/4 filesystems since the early days of Linux.