linux虚拟机卸载新硬盘的方法

1、启动vm，选择vm->Settings,按向导添加一块SCSI磁盘。进入Linux系统。

2、 fdisk -l 会看到有一块新的设置,如果你先前有一块硬盘(sda1, sda3...),新加的这块应该是(/dev/sdb)。

[root@localhost ~]# fdisk -l

Disk /dev/sda: 8589 MB, 8589934592 bytes

255 heads, 63 sectors/track, 1044 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sda1 * 1 13 104391 83 Linux

/dev/sda3 14 1044 8281507+ 83 Linux

Disk /dev/sdb: 8589 MB, 8589934592 bytes

255 heads, 63 sectors/track, 1044 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table

3、分区：

[root@localhost ~]# fdisk /dev/sdb

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 1044.

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): 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 cylinder (1-1044, default 1):

Using default value 1

Last cylinder or +size or +sizeM or +sizeK (1-1044, default 1044):

Using default value 1044

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

[root@localhost ~]# fdisk -l

Disk /dev/sda: 8589 MB, 8589934592 bytes

255 heads, 63 sectors/track, 1044 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sda1 * 1 13 104391 83 Linux

/dev/sda3 14 1044 8281507+ 83 Linux

Disk /dev/sdb: 8589 MB, 8589934592 bytes

255 heads, 63 sectors/track, 1044 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdb1 1 1044 8385898+ 83 Linux

4、格式化：

[root@localhost ~]# mkfs -t ext3 /dev/sdb1

mke2fs 1.39 (29-May-2006)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

1048576 inodes, 2096474 blocks

104823 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=2147483648

64 block groups

32768 blocks per group, 32768 fragments per group

16384 inodes per group

Superblock backups stored on blocks:

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

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 31 mounts or

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

5、装载：

[root@localhost ~]# mount /dev/sdb1 /u01/app/oracle

[root@localhost ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/VolGroup00-LogVol00

6.7G 5.8G 576M 92% /

/dev/sda1 99M 12M 82M 13% /boot

tmpfs 233M 0 233M 0% /dev/shm

/dev/sdb1 7.9G 147M 7.4G 2% /u01/app/oracle

6、编辑fstab文件（不然重启电脑后系统将不会保存之前的挂载 *** 作）：

[root@localhost ~]# vi /etc/fstab

/dev/VolGroup00/LogVol00 / ext3 defaults 1 1

LABEL=/boot /boot ext3 defaults 1 2

devpts /dev/pts devpts gid=5,mode=620 0 0

tmpfs /dev/shm tmpfs defaults 0 0

proc /proc proc defaults 0 0

sysfs /sys sysfs defaults 0 0

/dev/VolGroup00/LogVol01 swap swap defaults 0 0

/dev/sdc1 /u03 ext3 defaults 1 1

/dev/sdb1 /u01/app/oracle ext3 defaults 1 1

# Beginning of the block added by the VMware software

.host:/ /mnt/hgfs vmhgfs defaults,ttl=5 0 0

# End of the block added by the VMware software

卸载：

[root@localhost ~]# umount /dev/sdb1

[root@localhost ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/VolGroup00-LogVol00

6.7G 5.8G 576M 92% /

/dev/sda1 99M 12M 82M 13% /boot

tmpfs 233M 0 233M 0% /dev/shm

/dev/sda1

和/dev/sda2

#fdisk

/dev/sda

(注意sda后不要加数字)

command(m

for

help):

m

输入m后，就会看到很多命令

command(m

for

help):

p

输出当前磁盘的状态

command(m

for

help):

q

想要不存储离开吗？按下q,请不要随便按w

新增分区：#fdisk

/dev/sda

command(m

for

help):

n

此时系统会提示新增p（主分区）还是e（扩展分区），系统一般是（4个p）+e，而且e分区号必须从5开始

p

这里自行决定是p还是e

partition

number(1-4):3

编号可以随意

first

cylinder:

这里按下enter就行了

last

cylinder

or

..............：

+100m

再输入p的时候就能看到新增的分区了

删除分区：

#fdisk

/dev/sda

command(m

for

help):

d

选择分区号

记住q---不存储离开

w---存储离开

附上容易混淆的两个命令：

df(disk

free)---显示磁盘的文件系统与使用情形

du(disk

usage)---显示指定的目录或文件所占用的磁盘空间

建议看看刘遄老师的另外就是刘遄老师的《linux就该这么学》,书籍当中有详细的描述；