这里使用 Ubuntu Mint，20.1 Cinnamon。
我正在尝试尽可能地减少 SD 分区，但是当使用 resize2fs
sudo e2fsck -f /dev/sdb2
sudo resize2fs -M /dev/sdb2
它将分区大小调整为大约 7 GB，而不是预期的大约 5 GB。df 确认了这一点：
/dev/sdb2 6,4G 4,4G 1,7G 73%
它是最后一个分区（sdb1 是系统启动分区）。
为什么会出现这种行为？我希望它更接近实际的文件系统。
tune2fs命令的结果如下：
Filesystem volume name: writable
Last mounted on: /
Filesystem UUID: b09bb4c8-de4d-4ce6-a93f-30c4c9241a58
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
Filesystem flags: unsigned_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 417664
Block count: 1688722
Reserved block count: 69406
Overhead blocks: 34024
Free blocks: 512908
Free inodes: 294800
First block: 0
Block size: 4096
Fragment size: 4096
Group descriptor size: 64
Reserved GDT blocks: 439
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8032
Inode blocks per group: 502
Flex block group size: 16
Filesystem created: Tue Aug 9 14:05:18 2022
Last mount time: Mon Feb 13 23:27:27 2023
Last write time: Mon Feb 13 23:27:41 2023
Mount count: 2
Maximum mount count: -1
Last checked: Mon Feb 13 17:13:10 2023
Check interval: 0 (<none>)
Lifetime writes: 10 GB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 32
Desired extra isize: 32
Journal inode: 8
Default directory hash: half_md4
Directory Hash Seed: 24701edc-0cdd-48cd-a0ff-573147f7acac
Journal backup: inode blocks
Checksum type: crc32c
Checksum: 0x174a0a99