使用fdisk -l |grep Disk命令查看磁盘情况提示Disk /dev/sdb doesn‘t contain a valid partition table，解决方案如下：
使用，命令fdisk /dev/sdb，然后按照下面的步骤操作即可
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xc26af663.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won‘t be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
The device presents a logical sector size that is smaller thanthe physical sector size.
Aligning to a physical sector (or optimalI/O) size boundary is recommended, or performance may be impacted.
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition‘s system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First sector (2048-3515219967, default 2048):（直接回车）
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-3515219967, default 3515219967): （直接回车）
Using default value 3515219967
Command (m for help): p
Disk /dev/sdb: 1799.8 GB, 1799792623616 bytes
255 heads, 63 sectors/track, 218812 cylinders, total 3515219968 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 262144 bytes / 262144 bytes
Disk identifier: 0xc26af663
Device Boot Start End Blocks Id System
/dev/sdb1 2048 3515219967 1757608960 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
现在再fdisk -l，结果正常