linux有硬盘却看不到空间？这个时候需要挂载硬盘空间！教程附上，并非手把手，举一反三
lsblk显示所有硬盘和分区
root@OpenWrt:/# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 51.4M 0 loop /mnt/loop0
sda 8:0 0 119.2G 0 disk
├─sda1 8:1 0 16M 0 part /mnt/sda1
└─sda2 8:2 0 300M 0 part /rom
cfdisk （如果有不止一块硬盘，命令后面需要加上盘符 例如/dev/..）
lsblk
root@OpenWrt:/# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 51.4M 0 loop /overlay
sda 8:0 0 119.2G 0 disk
├─sda1 8:1 0 16M 0 part /boot
├─sda2 8:2 0 300M 0 part /rom
├─sda3 8:3 0 1K 0 part
├─sda5 8:5 0 1G 0 part
├─sda6 8:6 0 15G 0 part
└─sda7 8:7 0 103G 0 part
mkfs.ext4 /dev/sda5 格式化分区
root@OpenWrt:/# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 51.4M 0 loop /mnt/loop0
sda 8:0 0 119.2G 0 disk
├─sda1 8:1 0 16M 0 part /mnt/sda1
├─sda2 8:2 0 300M 0 part /rom
├─sda3 8:3 0 1K 0 part
├─sda5 8:5 0 1G 0 part
├─sda6 8:6 0 15G 0 part
└─sda7 8:7 0 103G 0 part
root@OpenWrt:/# mount /dev/sda5 /mnt/sda5 #挂在sda5
root@OpenWrt:/# mount /dev/sda6 /mnt/sda6 #挂在sda6
root@OpenWrt:/# mount /dev/sda7 /mnt/sda7 #挂在sda7
root@OpenWrt:/# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 51.4M 0 loop /mnt/loop0
sda 8:0 0 119.2G 0 disk
├─sda1 8:1 0 16M 0 part /mnt/sda1
├─sda2 8:2 0 300M 0 part /rom
├─sda3 8:3 0 1K 0 part
├─sda5 8:5 0 1G 0 part /mnt/sda5
├─sda6 8:6 0 15G 0 part /mnt/sda6
└─sda7 8:7 0 103G 0 part /mnt/sda7
root@OpenWrt:/#
overlay软路由openwrt的配置文件，需要扩容！
root@OpenWrt:/# cp -r /overlay/* /mnt/sda5 #备份overlay里面配置文件 不然扩容overlay文件之后所做的全部白费
root@OpenWrt:/# ls /mnt/sda5
lost+found upper work #看到upper work备份成功
文章来源于互联网:如何给Linux挂载硬盘
