dumpe2fs /dev/sdb1 | more
「dumpe2fs」は、ext2、ext3、ext4ファイルシステムの詳細情報を表示するコマンドです。
https://www.atmarkit.co.jp/ait/articles/1803/22/news028.html
【例】 Filesystem volume name: <none> Last mounted on: / Filesystem UUID: 2eb17fbd-41d4-4b49-b3fc-07148e1ad09b Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype n eeds_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink e xtra_isize metadata_csum Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 61022208 Block count: 244059136 Reserved block count: 12202956 Free blocks: 237184672 Free inodes: 60789455 First block: 0 Block size: 4096 Fragment size: 4096 Group descriptor size: 64 Reserved GDT blocks: 1024