Linux的ext4文件系统，分区容量和block、inode容量对应不上？？

fdisk -l

device Boot Start End SectorsSize Id Type /dev/sdb12048 2099199 20971521G 83 Linux /dev/sdb2 2099200 6293503 41943042G 83 Linux **/dev/sdb3** 6293504 6293903 400200K 83 Linux

blkid /dev/sdb3

/dev/sdb3: UUID="96cac981-3764-474b-82fe-89efc5ec17be" TYPE="ext4" PARTUUID="81a3aca2-03"

tune2fs /dev/sdb3 -l

tune2fs 1.42.13 (17-May-2015) Filesystem volume name: <none> Last mounted on:<not available> Filesystem UUID:96cac981-3764-474b-82fe-89efc5ec17be Filesystem magic number:0xEF53 Filesystem revision #:1 (dynamic) Filesystem features:ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hashDefault mount options:user_xattr acl优艾设计网_PS交流 Filesystem state: clean Errors behavior:Continue Filesystem OS type: Linux Inode count:32 Block count:200 Reserved block count: 10 Free blocks:177 Free inodes:21 First block:1 Block size: 1024 Fragment size:1024 Blocks per group: 8192 Fragments per group:8192 Inodes per group: 32 Inode blocks per group: 4 Flex block group size:16 Filesystem created: Sun Oct 30 20:41:15 2016 Last mount time:n/a Last write time:Sun Oct 30 20:41:15 2016 Mount count:0 Maximum mount count:-1 Last checked: Sun Oct 30 20:41:15 2016 Check interval: 0 (<none>) Lifetime writes:90 kB Reserved blocks uid:0 (user root) Reserved blocks gid:0 (group root) First inode:11 Inode size:128 Default directory hash: half_md4 Directory Hash Seed:83db19a5-4c95-418e-91f1-3acc3de261d9

/dev/sdb3文件系统size为200K，但是（block sum size + inode sum size）1024B200+128B32>200K，请问这里怎么解释呢？