[linuxstudy@xxxx ~]$ sudo dumpe2fs -h /dev/sdb1
dumpe2fs 1.42.9 (28-Dec-2013)
Filesystem volume name: /usbmemory
Last mounted on: /usbmemory2
Filesystem UUID: 45d9c0a6-98b7-4091-9d13-8e510b7738c8
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: ext_attr resize_inode dir_index filetype sparse_super large_file
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: not clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 65536
Block count: 262144
Reserved block count: 13107
Free blocks: 257701
Free inodes: 65524
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 63
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
Filesystem created: Thu Jun 29 20:36:58 2023
Last mount time: Fri Jul 28 12:55:11 2023
Last write time: Fri Jul 28 12:55:11 2023
Mount count: 17
Maximum mount count: -1
Last checked: Thu Jun 29 20:36:58 2023
Check interval: 0 (<none>)
Lifetime writes: 120 kB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Default directory hash: half_md4
Directory Hash Seed: e7c76377-046d-4c27-8f6d-761d1819ae84
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