制作CentOS 6.4 U盘启动安装盘

本次使用的U盘为Kingston16G,/dev/sdb,默认已有分区为/dev/sdb4

推荐阅读：

下面将对U盘进行分区第一个分区为FAT32，引导计算机进行系统安装，第二个分区为EXT2,存放我们的系统ISO文件。

删除原有分区

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

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
        switch off the mode (command 'c') and change display units to
        sectors (command 'u').

Command (m for help): d
Selected partition 4

Command (m for help): p

Disk /dev/sdb: 15.5 GB, 15479597056 bytes
255 heads, 63 sectors/track, 1881 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xcad4ebea

  Device Boot      Start        End      Blocks  Id  System

Command (m for help): n
Command action
  e  extended
  p  primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1881, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1881, default 1881): +250M

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): l

0  Empty          24  NEC DOS        81  Minix / old Lin bf  Solaris       
1  FAT12          39  Plan 9          82  Linux swap / So c1  DRDOS/sec (FAT-
2  XENIX root      3c  PartitionMagic  83  Linux          c4  DRDOS/sec (FAT-
3  XENIX usr      40  Venix 80286    84  OS/2 hidden C:  c6  DRDOS/sec (FAT-
4  FAT16 <32M      41  PPC PReP Boot  85  Linux extended  c7  Syrinx       
5  Extended        42  SFS            86  NTFS volume set da  Non-FS data   
6  FAT16          4d  QNX4.x          87  NTFS volume set db  CP/M / CTOS / .
7  HPFS/NTFS      4e  QNX4.x 2nd part 88  Linux plaintext de  Dell Utility 
8  AIX            4f  QNX4.x 3rd part 8e  Linux LVM      df  BootIt       
9  AIX bootable    50  OnTrack DM      93  Amoeba          e1  DOS access   
a  OS/2 Boot Manag 51  OnTrack DM6 Aux 94  Amoeba BBT      e3  DOS R/O       
b  W95 FAT32      52  CP/M            9f  BSD/OS          e4  SpeedStor     
c  W95 FAT32 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi eb  BeOS fs       
e  W95 FAT16 (LBA) 54  OnTrackDM6      a5  FreeBSD        ee  GPT           
f  W95 Ext'd (LBA) 55  EZ-Drive        a6  OpenBSD        ef  EFI (FAT-12/16/
10  OPUS            56  Golden Bow      a7  NeXTSTEP        f0  Linux/PA-RISC b
11  Hidden FAT12    5c  Priam Edisk    a8  Darwin UFS      f1  SpeedStor     
12  Compaq diagnost 61  SpeedStor      a9  NetBSD          f4  SpeedStor     
14  Hidden FAT16 <3 63  GNU HURD or Sys ab  Darwin boot    f2  DOS secondary 
16  Hidden FAT16    64  Novell Netware  af  HFS / HFS+      fb  VMware VMFS   
17  Hidden HPFS/NTF 65  Novell Netware  b7  BSDI fs        fc  VMware VMKCORE
18  AST SmartSleep  70  DiskSecure Mult b8  BSDI swap      fd  Linux raid auto
1b  Hidden W95 FAT3 75  PC/IX          bb  Boot Wizard hid fe  LANstep       
1c  Hidden W95 FAT3 80  Old Minix      be  Solaris boot    ff  BBT           
1e  Hidden W95 FAT1
Hex code (type L to list codes): b
Changed system type of partition 1 to b (W95 FAT32)

Command (m for help): n
Command action
  e  extended
  p  primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (34-1881, default 34):
Using default value 34
Last cylinder, +cylinders or +size{K,M,G} (34-1881, default 1881):
Using default value 1881

Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 83

Command (m for help): p

Disk /dev/sdb: 15.5 GB, 15479597056 bytes
255 heads, 63 sectors/track, 1881 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xcad4ebea

  Device Boot      Start        End      Blocks  Id  System
/dev/sdb1              1          33      265041    b  W95 FAT32
/dev/sdb2              34        1881    14844060  83  Linux

Command (m for help): a
Partition number (1-4): 1

Command (m for help): p

Disk /dev/sdb: 15.5 GB, 15479597056 bytes
255 heads, 63 sectors/track, 1881 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xcad4ebea

  Device Boot      Start        End      Blocks  Id  System
/dev/sdb1  *          1          33      265041    b  W95 FAT32
/dev/sdb2              34        1881    14844060  83  Linux

Command (m for help): w
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 or after you run partprobe(8) or kpartx(8)

WARNING: If you have created or modified any DOS 6.x
partitions, please see the fdisk manual page for additional
information.
Syncing disks.
[root@localhost ~]#