Linux U盘分区格式化 fdisk命令

今天为方便修复系统，做了个U盘WINPE的启动盘。当我兴高采烈的将这个U盘

插到Linux虚拟机上却发现出现了4个分区，而且根本就挂不上，顿时便郁闷了！

看来这样的分区Linux识别不了。只有用个专门的U盘来当启动盘了。这个U盘我

还得用来拷资料呢，那就乖乖的恢复它吧。

首先想到的是在windows下格式化，这是最简单的了。一试，没用，分区表格不了

看来得用命令行的删除分区信息的工具了，无奈，对windows 命令不熟悉，只能

放弃了。。。

于是想到了linux下fdisk这个东东，以前没仔细研究过，看来是刚拿来研究的时

候了。

google找了个教程，作为参考：

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#fdisk /dev/sdb    /*进入fdisk命令操作空间*/

#Command (m for help): m     /*命令查看*/

Command action

a   toggle a bootable flag引导扇区

b   edit bsd disklabel     编辑卷标(linux下使用的卷标bsd通用)

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): p

Disk /dev/sdb: 2055 MB, 2055208960 bytes

64 heads, 62 sectors/track, 1011 cylinders

Units = cylinders of 3968 * 512 = 2031616 bytes

Disk identifier: 0x00000000

Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1         133      263871+   6  FAT16

/dev/sdb2   *         134         200      132928   83  Linux          /*boot 分区*/

＃Command (m for help): d

＃Partition number (1-4): 1

Command (m for help): p

Disk /dev/sdb: 2055 MB, 2055208960 bytes

64 heads, 62 sectors/track, 1011 cylinders

Units = cylinders of 3968 * 512 = 2031616 bytes

Disk identifier: 0x00000000

Device Boot      Start         End      Blocks   Id  System

/dev/sdb2   *         134         200      132928   83  Linu

＃Command (m for help): d

Selected partition 2

＃Command (m for help): p                                           /*查看此时已无分区*/

Disk /dev/sdb: 2055 MB, 2055208960 bytes

64 heads, 62 sectors/track, 1011 cylinders

Units = cylinders of 3968 * 512 = 2031616 bytes

Disk identifier: 0x00000000

Device Boot      Start         End      Blocks   Id  System

＃Command (m for help): w                                      /*最后写入分区表*/

The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.

The kernel still uses the old table.

The new table will be used at the next reboot.

Syncing disks.

/*下边给磁盘增加一分区并格式化*/

＃ls /dev/sd*

＃/dev/sda  /dev/sda1  /dev/sda2  /dev/sdb

＃Command (m for help): n

Command action

e   extended

p   primary partition (1-4)

＃p                                                                                                  /*增加主分区*/

＃Partition number (1-4): 1

＃First cylinder (1-1011, default 1):                                         /*回车默认*/

Using default value 1

＃Last cylinder, +cylinders or +size{K,M,G} (1-1011, default 1011):                       /*回车默认*/

Using default value 1011

＃Command (m for help): p                                            /*此时有sdb1分区*/

Disk /dev/sdb: 2055 MB, 2055208960 bytes

64 heads, 62 sectors/track, 1011 cylinders

Units = cylinders of 3968 * 512 = 2031616 bytes

Disk identifier: 0x00000000

Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1        1011     2005793   83  Linux

＃Command (m for help): w                                   /*最后写入分区表*/

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

＃sudo mkfs.vfat -F 32 -n disk /dev/sdb1           /*格式化*/

下面便是磁盘格式化了 命令是mkfs.ext3 设备名 这里的设备名要是分区名 ， 而不是硬盘设备名 (切记先记好分区名 ， 别输入错 ， 不然格式化错了就麻烦了)

等待之后分区就格式化好了 ， 记得复制之前要一下

再次提示下修复命令 fsck.ext3 设备名

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