mkfs.ext4命令来自于英文词组“make filesystem Ext4”的缩写，其功能是用于对磁盘设备进行Ext4格式化的操作。
语法格式：mkfs.ext4 [参数] 设备
常用参数：
| -c | 格式化前检查分区是否有坏块 |
| -q | 执行时不显示任何信息 |
| -b | 指定block size大小 |
| -F | 强制格式化 |
实例参考
检查指定的磁盘设备并进行格式化操作：
[root@liuzhongwei ~]# mkfs.ext4 -c /dev/sdb
mke2fs 1.44.3 (10-July-2018)
Creating filesystem with 5242880 4k blocks and 1310720 inodes
Filesystem UUID: 2468ba17-0d37-4900-b67e-5f3a24084fc5
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Checking for bad blocks (read-only test): 0.00% done, 0:00 elapsed. (0/0/0 errdone
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done对指定的磁盘设备直接进行格式化操作：
[root@liuzhongwei ~]# mkfs.ext4 /dev/sdb
mke2fs 1.44.3 (10-July-2018)
Creating filesystem with 5242880 4k blocks and 1310720 inodes
Filesystem UUID: 62ccf385-efef-41ab-8938-bfd65bac7066
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done对指定的磁盘设备进行格式化操作，添加卷标识，并修改块大小：
[root@liuzhongwei ~]# mkfs.ext4 -L 'liuzhongwei' -b 2048 /dev/sdb
mke2fs 1.44.3 (10-July-2018)
Creating filesystem with 10485760 2k blocks and 1310720 inodes
Filesystem UUID: 73ad248c-2a01-49dd-aa46-8770ecbc56fd
Superblock backups stored on blocks:
16384, 49152, 81920, 114688, 147456, 409600, 442368, 802816, 1327104,
2048000, 3981312, 5619712, 10240000
Allocating group tables: done
Writing inode tables: done
Creating journal (65536 blocks): done
Writing superblocks and filesystem accounting information: done