, 3 min read
dumpe2fs: When was my hard-drive first formatted?
Original post is here eklausmeier.goip.de/blog/2021/01-23-dumpe2fs-when-was-my-hard-drive-first-formatted.
I repeatedly forget to remember when my hard-drive or SSD was first formatted.
Command for this is dumpe2fs
. This command is part of package e2fsprogs. Example:
# dumpe2fs -h /dev/sda1
dumpe2fs 1.45.6 (20-Mar-2020)
Filesystem volume name: <none>
Last mounted on: /boot
Filesystem UUID: 83a1bedb-6fd3-46d0-8900-e4e09536168e
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: ext_attr resize_inode dir_index filetype sparse_super
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 62248
Block count: 248832
Reserved block count: 12441
Free blocks: 126393
Free inodes: 61933
First block: 1
Block size: 1024
Fragment size: 1024
Reserved GDT blocks: 256
Blocks per group: 8192
Fragments per group: 8192
Inodes per group: 2008
Inode blocks per group: 251
RAID stride: 4
RAID stripe width: 4
Filesystem created: Mon Apr 21 13:45:32 2014
Last mount time: Sun May 31 14:18:09 2020
Last write time: Mon Jun 1 00:40:25 2020
Mount count: 35
Maximum mount count: -1
You must be root to use this command. It does not work for encrypted disks (LUKS) or volume groups.
Added 18-Feb-2023: Compare output for SSD and M.2 disk.
Entry | 55 GB SSD | 120 GB ADATA SSD | 2TB Samsung PM9A1 M.2 PCIe 4.0 |
---|---|---|---|
Filesystem volume name | arch-main | boot | <none> |
Last mounted on | / | /boot | / |
Filesystem UUID | 37e39e08-8cd4-48a8-ac56-4873ce004f06 | a8d6c185-0769-4ec5-9088-2c7087815346 | 63669b64-5753-44a6-8626-561a6c98ab5b |
Filesystem magic number | 0xEF53 | 0xEF53 | 0xEF53 |
Filesystem revision # | 1 (dynamic) | 1 (dynamic) | 1 (dynamic) |
Filesystem features | has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize | has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file dir_nlink extra_isize | has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum |
Filesystem flags | signed_directory_hash | signed_directory_hash | signed_directory_hash |
Default mount options | user_xattr acl | user_xattr acl | user_xattr acl |
Filesystem state | clean | clean | clean |
Errors behavior | Continue | Continue | Continue |
Filesystem OS type | Linux | Linux | Linux |
Inode count | 3670016 | 128016 | 125009920 |
Block count | 14653440 | 512000 | 500029696 |
Reserved block count | 732672 | 25600 | 25001484 |
Overhead clusters | 276365 | 26652 | 8129800 |
Free blocks | 6975285 | 346260 | 255217479 |
Free inodes | 3205664 | 127648 | 118970216 |
First block | 0 | 1 | 0 |
Block size | 4096 | 1024 | 4096 |
Fragment size | 4096 | 1024 | 4096 |
Group descriptor size | 64 | ||
Reserved GDT blocks | 1020 | 256 | 1024 |
Blocks per group | 32768 | 8192 | 32768 |
Fragments per group | 32768 | 8192 | 32768 |
Inodes per group | 8192 | 2032 | 8192 |
Inode blocks per group | 512 | 254 | 512 |
Flex block group size | 16 | 16 | 16 |
Filesystem created | Wed May 20 11:26:46 2015 | Mon Jan 2 21:21:35 2017 | Sun May 1 11:51:33 2022 |
Last mount time | Sun Feb 19 11:54:45 2023 | Sat Feb 18 16:06:32 2023 | Sat Feb 18 11:08:18 2023 |
Last write time | Sun Feb 19 11:54:45 2023 | Sat Feb 18 16:06:32 2023 | Sat Feb 18 11:08:18 2023 |
Mount count | 704 | 1025 | 240 |
Maximum mount count | -1 | -1 | -1 |
Last checked | Wed Feb 1 19:59:44 2017 | Mon Jan 2 21:21:35 2017 | Sun May 1 11:51:33 2022 |
Check interval | 0 (<none> ) |
0 (<none> ) |
0 (<none> ) |
Lifetime writes | 1116 GB | 55 GB | 1995 GB |
Reserved blocks uid | 0 (user root) | 0 (user root) | 0 (user root) |
Reserved blocks gid | 0 (group root) | 0 (group root) | 0 (group root) |
First inode | 11 | 11 | 11 |
Inode size | 256 | 128 | 256 |
Required extra isize | 28 | 32 | |
Desired extra isize | 28 | 32 | |
Journal inode | 8 | 8 | 8 |
First orphan inode | 100401983 | ||
Default directory hash | half_md4 | half_md4 | half_md4 |
Directory Hash Seed | 5163f87f-0627-40b9-9ff4-cefa847e11ca | 0f5d9799-16f0-4429-b7bd-f6d8c70cc07c | 120bab98-bb6d-489c-871f-0570938845db |
Journal backup | inode blocks | inode blocks | inode blocks |
Checksum type | crc32c | ||
Checksum | 0x55d63aac | ||
Journal features | journal_incompat_revoke | journal_incompat_revoke | journal_incompat_revoke journal_64bit journal_checksum_v3 |
Total journal size | 128M | 8M | 1024M |
Total journal blocks | 32768 | 8192 | 262144 |
Max transaction length | 32768 | 8192 | 262144 |
Fast commit length | 0 | 0 | 0 |
Journal sequence | 0x0035c48b | 0x000008d4 | 0x003aeb32 |
Journal start | 1 | 1 | 1 |
Journal checksum type | crc32c | ||
Journal checksum | 0x29b66216 |