Linux磁带备份，所以我先添加一块硬盘，并相应的建立分区，格式化，然后挂载使用。下面看我操作的步骤：
　　1.先用Fdisk －l 来查看当前状态下磁盘情况
[root@aaaa ~]# fdisk -l
Disk /dev/sda: 300.0 GB， 300000000000 bytes
255 heads， 63 sectors/track， 36472 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1305    10482381   83  Linux
/dev/sda2            1306        2610    10482412+  82  Linux swap / Solaris
/dev/sda3            2611       36472   271996515   83  Linux
Disk /dev/hdb: 2147 MB， 2147483648 bytes
16 heads， 63 sectors/track， 4161 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Disk /dev/hdb doesn't contain a valid partition table
　　上面红色标识行可以看出，我添加了一块新硬盘/dev/hdb，大小为2G，未分区格式化状态。
　　2.用Fdisk /dev/hdb来进行分区操作。
[root@linux1 ~]# fdisk /dev/hdb
Device contains neither a valid DOS partition table， nor Sun， SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only，
until you decide to write them. After that， of course， the previous
content won't be recoverable.
The number of cylinders for this disk is set to 4161.
There is nothing wrong with that， but this is larger than 1024，
and could in certain setups cause problems with:
1) software that runs at boot time (e.g.， old versions of LILO)
2) booting and partitioning software from other OSs
(e.g.， DOS FDISK， OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): n //输入N表示新建一个分区
Command action
e extended
p primary partition (1-4)
p //p 表示建立一个原始分区
Partition number (1-4): 1 //1 表示此分区编号为1.
First cylinder (1-4161， default 1): 1 //1表示使用默认起始柱面号.如果要分多个区的话，先盘算好要多大，再输入数字
Last cylinder or size or sizeM or sizeK (1-4161， default 4161): // 输入: 回车 表示使用默认结束柱面号.即此分区使用整个硬盘空间
Using default value 4161
Command (m for help): w //保存分区
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.