Tune2fs
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Tune2fs allows you to view and set filesystem options for a specific ext2 or ext3 partition, for example the block size or the frequency of an fsck.
Example
tweedleburg:~ # tune2fs -l /dev/sda1 tune2fs 1.40.8 (13-Mar-2008) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: a0bc0308-48b8-42fb-a1a9-c6de57d9be14 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 61054976 Block count: 244190000 Reserved block count: 12209500 Free blocks: 129663954 Free inodes: 60352360 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 965 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Filesystem created: Sun Jul 6 22:03:27 2008 Last mount time: Tue Sep 30 11:25:51 2008 Last write time: Tue Sep 30 11:25:51 2008 Mount count: 45 Maximum mount count: -1 Last checked: Sat Jul 12 09:24:26 2008 Check interval: 0 (<none>) Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Journal inode: 8 First orphan inode: 6144419 Default directory hash: tea Directory Hash Seed: e6ba3cfa-aa30-40d7-b085-b4e5533da108 Journal backup: inode blocks