挂载磁盘不成功显示mount: /mnt: wrong fs type, bad option, bad superblock..............

[23:25:32 root@8 ~]#mount /dev/sdb2 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/sdb2, missing codepage or helper program, or other error.

输入 lsblk  -f 查看 /dev/sdb2 有没有文件系统格式

[23:25:04 root@8 ~]#lsblk -f
NAME   FSTYPE  LABEL                      UUID                                 MOUNTPOINT
sda                                                                           
├─sda1 ext4                                 01cc8123-a156-44ee-9552-9419665cf69a /boot
├─sda2 xfs                                   62121852-d67e-4a7b-b626-198c0c01f77f /
├─sda3 swap                               876fcdf2-1a4e-4318-89ed-60a9432ddc35 [SWAP]
├─sda4                                                                        
└─sda5 xfs                                   27feb26d-369a-4884-8a81-820a86414e33 /data
sdb                                                                           
├─sdb1                                                                        
├─sdb2                                          
└─sdb3                                                                        
sr0    iso9660 CentOS-8-1-1911-x86_64-dvd 2020-01-03-21-42-40-00  

可以看到 sdb2 并没有文件系统格式

输入 mkfs  -t  ext2  /dev/sdb2 格式化磁盘  

输入 mount  /dev/sdb2  /mnt

[23:26:15 root@8 ~]#df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        887M     0  887M   0% /dev
tmpfs           904M     0  904M   0% /dev/shm
tmpfs           904M  9.4M  894M   2% /run
tmpfs           904M     0  904M   0% /sys/fs/cgroup
/dev/sda2        50G  4.4G   46G   9% /
/dev/sda5        30G  247M   30G   1% /data
/dev/sda1       2.0G  143M  1.7G   8% /boot
tmpfs           181M  1.2M  180M   1% /run/user/42
tmpfs           181M  4.0K  181M   1% /run/user/0
/dev/sdb2        92M  1.6M   86M   2% /mnt

可以看到 sdb2 已经挂载磁盘了