制作U盘CentOS6 安装盘－－（制作篇）?方法原理：??１、centos6.2的dvd文件非常大，超过4G，fat32文件系统不支持4G
制作U盘CentOS6 安装盘－－（制作篇）
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方法原理：
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?１、centos6.2的dvd文件非常大，超过4G，fat32文件系统不支持4G以上文件；而用于引导linux的文件系统恰恰就是fat32格式。?
?２、?将u盘分成两个区，一个用于启动linux，为fat32文件系统；一个用于存放安装文件，为ext4文件系统。
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?过程步骤：
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１、U盘参数：16G,/dev/sdb,默认已有分区为/dev/sdb4
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??2、删除原有分区?????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EXT4,存放我们的系统ISO文件。?
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?以下过程命令：[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 # 删除分区Selected?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):?n? #新建分区Command?action??e???extended??p???primary?partition?(1-4)pPartition?number?(1-4):?1 #First?cylinder?(1-1881,?default?1):?Using?default?value?1Last?cylinder,?+cylinders?or?+size{K,M,G}?(1-1881,?default?1881):?+250M #设置分区１大小?Command?(m?for?help):?t????? ?#更改分区类型Selected?partition?1Hex?code?(type?L?to?list?codes):?l #查看支持的分区类型?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):?n #新建分区Command?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):?t #更改分区类型Partition?number?(1-4):?2Hex?code?(type?L?to?list?codes):?83 #分区类型id?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):?a?????? #调整硬盘的启动分区Partition?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):?w #写入硬盘分区表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?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?~]#?
?3、格式化U盘的两个分区 命名第一个分区卷名为boot，FAT32格式 第二个卷名为data，ext4格式,这个卷名大家随便起，各人习惯而已。??
?4、挂载boot分区和data分区到/mnt目录下?
??5、拷贝CentOS6.4第一张光盘CentOS-6.4-x86_64-bin-DVD1.iso中isolinux目录，到U盘boot分区中并改名为syslinux目录，然后重命名isolinux.cfg文件为syslinux.cfg。?
??6、如果系统中没有安装syslinux工具，yum?install?syslinux安装一下。?
??7、使用syslinux工具将U盘的/dev/sdb1分区制作成启动盘，拷贝光盘中image目录到boot分区。?
??8、将CentOS的两个DVDISO文件拷贝到U盘的data分区。文件比较大，使用rz无法上传，可以使用其它工具上传，如WinScp??
?9、Ｕ盘安装盘制作完成，下节使用虚拟机来进行验证。
