tldr/pages/linux/dumpe2fs.md

dumpe2fs

Print the super block and blocks group information for ext2/ext3/ext4 filesystems. Unmount the partition before running this command using umount {{device}}. More information: https://manned.org/dumpe2fs.

• Display ext2, ext3 and ext4 filesystem information:

dumpe2fs {{/dev/sdXN}}

• Display the blocks which are reserved as bad in the filesystem:

dumpe2fs -b {{/dev/sdXN}}

• Force display filesystem information even with non-recognisable feature flags:

dumpe2fs -f {{/dev/sdXN}}

• Only display the superblock information and not any of the block group descriptor detail information:

dumpe2fs -h {{/dev/sdXN}}

• Print the detailed group information block numbers in hexadecimal format:

dumpe2fs -x {{/dev/sdXN}}