我有两个非常相似的分区，/dev/sdb1（标记为“bigb”）和/dev/sdc1（标记为“bigc”）。我以前可以两者使用来安装mount -n -L bigX /mnt/donottouch/localX（与X是b或c）。但是， mount 最近开始要求我指定，-t ext4 但仅限于 bigc。
bigb 安装得很好：
# mount -n -L bigb /mnt/donottouch/localb -vvv
mount: fstab path: "/etc/fstab"
mount: mtab path: "/etc/mtab"
mount: lock path: "/etc/mtab~"
mount: temp path: "/etc/mtab.tmp"
mount: UID: 0
mount: eUID: 0
mount: spec: "/dev/sdb1"
mount: node: "/mnt/donottouch/localb"
mount: types: "(null)"
mount: opts: "(null)"
final mount options: '(null)'
mount: you didn't specify a filesystem type for /dev/sdb1
I will try type …