U盤安裝CentOS6.4

本次使用的U盤爲Kingston16G,/dev/sdb,默認已有分區爲/dev/sdb4
下面將對U盤進行分區第一個分區爲FAT32，引導計算機進行系統安裝，第二個分區爲EXT2,存放我們的系統ISO文件。
刪除原有分區

[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 ~]#

格式化U盤的兩個分區，並命名第一個分區卷名爲boot，FAT32格式,第二個卷名爲data，ext2格式,這個卷名大家隨便起，各人習慣而已。