linux的mount命令出错you must specify the filesystem type

# mount /dev/sdb /mnt

mount: you must specify the filesystem type

解决方案：
先执行  mkfs.ext3 /dev/vdb # 该命令意思为快速格式化U盘为ext3格式

# mkfs.ext3 /dev/vdb

mke2fs 1.41.12 (17-May-2010)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

32768000 inodes, 131072000 blocks

6553600 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=4294967296

4000 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,

102400000

 

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

 

This filesystem will be automatically checked every 25 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

然后重新mount就可以了，或者直接指定挂载类型就行了：#mount -t ext3 /dev/vdb /home