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 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

[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): dSelected partition 4
Command (m for help): p
Disk /dev/sdb: 15.5 GB, 15479597056 bytes255 heads, 63 sectors/track, 1881 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xcad4ebea
Device Boot Start End Blocks Id System
Command (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 1First cylinder (1-1881, default 1): Using default value 1Last cylinder, +cylinders or +size{K,M,G} (1-1881, default 1881): +250M
Command (m for help): tSelected partition 1Hex 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 b11 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 auto1b 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 FAT1Hex code (type L to list codes): bChanged system type of partition 1 to b (W95 FAT32)
Command (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 2First cylinder (34-1881, default 34): Using default value 34Last cylinder, +cylinders or +size{K,M,G} (34-1881, default 1881): Using default value 1881
Command (m for help): tPartition number (1-4): 2Hex code (type L to list codes): 83
Command (m for help): p
Disk /dev/sdb: 15.5 GB, 15479597056 bytes255 heads, 63 sectors/track, 1881 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk 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): aPartition number (1-4): 1
Command (m for help): p
Disk /dev/sdb: 15.5 GB, 15479597056 bytes255 heads, 63 sectors/track, 1881 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk 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): wThe 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 atthe next reboot or after you run partprobe(8) or kpartx(8)
WARNING: If you have created or modified any DOS 6.xpartitions, please see the fdisk manual page for additionalinformation.Syncing disks.[root@localhost ~]#

格式化U盘的两个分区，并命名第一个分区卷名为boot，FAT32格式,第二个卷名为data，ext2格式,这个卷名大家随便起，各人习惯而已。