今天被坑了，给一个同事安装win8系统时，到一半说不能安装在GPT分区上面，下面讲如何解决：
把GPT磁盘转换为MBR磁盘，安装系统到提示你不能安装在那个磁盘的一步， 在选择分区界面，按下SHIFT+F10调出命令提示符
键入 diskpart
打开diskpart工具
★选择目标磁盘
list disk--------------------列出系统拥有的磁盘
select disk 0 --------------选择0号磁盘，请根据磁盘大小，自行判断你的目标磁盘
★清空目标磁盘，并转换为MBR格式
clean-------------------------清除磁盘,该命令会抹去磁盘上所有数据
convert mbr------------------将磁盘转换为GPT格式
list partition-----------------列出磁盘上的分区，因为我们刚转换成mbr格式，因此，分区为空
PS：其实，一个diskpart工具，几乎可以代替其他的第三方磁盘工具了，比如著名的DiskGenius，是无法更改GPT格式磁盘的分区ID的，但是diskpart可以。
PS：在安装MAC系统的时候，需要更改分区ID。
PS：关于diskpart的详细使用，可以在diskpart中键入help查看
做完上边的操作，回到安装界面，刷新一下，按着以前的安装方式直接安装系统就可以了。
centos安装不支持GPT模式如何处理
安装centos 5.x ，分区时系统报下面的提示，不支持GPT ，无法分区。
提示:
Your boot partition is on a disk using the GPT partitioning Scheme but this machines cannot boot using GPT.
解决方法：
用快捷键：Ctrl+Alt+F2到命令界面:
查看硬盘的设备名称：
fdisk -l
假设是/dev/sda后面显示的类型是GPT,输入:
parted
再输入:
select
再输入:
/dev/sda(不要选择sda1或sda2什么的，只输入sda即可)
输入：mklabel msdos
输入：yes
Your disk type?[gpt]?
输入：
Msdos(很重要)
quit
重启服务器，
然后重新格式化所要安装的磁盘，安装即可。
重置修改已经忘记的Windows 7登录密码方法教程
忘记windows登录密码是件悲催的事情，不过还好有方法重置密码，不用重装系统也能继续使用。
重置准备：一个windows 7安装介质（光盘和U盘都可以），如果你没有windows 7安装介质，那就没必要继续下面的步骤了。
插入windows 7安装介质，并选择从安装介质启动，然后选择修复计算机，
然后选择命令提示符，
在弹出的命令提示符窗口中输入下面命令并回车，
copy c:\windows\system32\sethc.exe c:\
请注意此处c代表系统盘符，如果提示找不到文件，请找到系统盘的正确盘符。该命令是将粘滞键执行文件备份，接着输入下面的命令并回车，
copy c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe
该命令是将命令提示符执行文件替换掉粘滞键执行文件，完成后可以看到下图的提示。
现在重启你的电脑并直接进入原有windows 7系统，在登录界面连按五次Shift键会弹出命令提示符窗口，
接着输入重置密码命令，输入完成后回车，
net user 你的用户名 新密码
其中用户名是你登录windows 7时使用的用户名（即密码方框上方显示的名称），新密码是用来登录系统使用的。
提示命令成功后，现在你可以使用刚才设置的新密码登录系统。当然为了防止登录界面能继续重置密码，你还需要将之前替换的粘滞键执行文件还原。插入windows 7安装介质，选择修复计算机并选择命令提示符，在打开命令提示符后输入 copy c:\sethc.exe c:\windows\system32\sethc.exe
如何使用fdisk与parted对不同容量硬盘分区
一、简介
通常我们用的比较多的一般都是fdisk工具来进行分区，但是现在由于磁盘越来越廉价，而且磁盘空间越来越大;而fdisk工具他对分区是有大小限制的，它只能划分小于2T的磁盘。如果使用fdisk对大于2T的磁盘分区，虽然可以分区，但仅识别2T的空间，所以磁盘容量超过2T的话，就使用Parted工具来实现对GPT磁盘进行分区操作。
GPT格式的磁盘相当于原来MBR磁盘中原来保留4个partition table的4*16个字节，只留第一个16个字节，类似于扩展分区，真正的partitiontable在512字节之后，GPT磁盘没有四个主分区的限制。
下面是实际演练，分别使用fdisk与parted对不同容量硬盘进行分区。
二、fdisk分区(2T容量以下硬盘使用)
1、查看当前磁盘情况
df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 133G 31G 96G 25% / tmpfs 16G 9.9G 5.9G 63% /dev/shm /dev/sda1 504M 43M 436M 9% /boot /dev/sda5 2.7T 2.4T 204G 93% /data /dev/sdb1 2.7T 2.4T 204G 93% /data [root@bidw tmp]# fdisk -l Disk /dev/sda: 299.4 GB, 299439751168 bytes 255 heads, 63 sectors/track, 36404 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: 0x000ccf41 Device Boot Start End Blocks Id System /dev/sda1 * 1 66 524288 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 66 1371 10485760 82 Linux swap / Solaris /dev/sda3 1371 18888 140704768 83 Linux /dev/sda4 18888 36405 140705792 5 Extended /dev/sda5 18888 36405 140704768 83 Linux WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdb: 2999.0 GB, 2998960914432 bytes 255 heads, 63 sectors/track, 364602 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: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 1 267350 2147483647+ ee GPT Disk /dev/sdc: 1999.8 GB, 1999844147200 bytes 81 heads, 63 sectors/track, 765421 cylinders Units = cylinders of 5103 * 512 = 2612736 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x42d69282
可以看到/dev/sdc是需要分区的
2、使用fdisk进行分区
[root@bidw tmp]# fdisk /dev/sdc
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xc1b09294.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
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): m
Command action
a toggle a bootable flag
b edit bsd disklabel
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): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-243133, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-243133, default 243133):
Using default value 243133
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 22: Invalid argument.
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)
Syncing disks.3、格式化为ext4系统
[root@bidw tmp]# mkfs.ext4 /dev/sdc1 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 122060800 inodes, 488242944 blocks 24412147 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296 14900 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 102400000, 214990848 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 37 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.
然后查看磁盘情况
[root@bidw tmp]# fdisk -l Disk /dev/sda: 299.4 GB, 299439751168 bytes 255 heads, 63 sectors/track, 36404 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: 0x000ccf41 Device Boot Start End Blocks Id System /dev/sda1 * 1 66 524288 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 66 1371 10485760 82 Linux swap / Solaris /dev/sda3 1371 18888 140704768 83 Linux /dev/sda4 18888 36405 140705792 5 Extended /dev/sda5 18888 36405 140704768 83 Linux WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdb: 2999.0 GB, 2998960914432 bytes 255 heads, 63 sectors/track, 364602 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: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 1 267350 2147483647+ ee GPT Disk /dev/sdc: 1999.8 GB, 1999844147200 bytes 81 heads, 63 sectors/track, 765421 cylinders Units = cylinders of 5103 * 512 = 2612736 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x42d69282 Device Boot Start End Blocks Id System /dev/sdc1 1 765634 1953513560 83 Linux
可以看到/dev/sdc1已经格式化完成
4、挂载
[root@bidw tmp]# mount /dev/sdc1 /u01 [root@bidw tmp]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 133G 32G 95G 25% / tmpfs 16G 9.9G 5.9G 63% /dev/shm /dev/sda1 504M 43M 436M 9% /boot /dev/sda5 2.7T 2.4T 204G 93% /data /dev/sdb1 2.7T 2.4T 204G 93% /data /dev/sdc1 1.8T 196M 1.7T 1% /u01
可以看到/dev/sdc1已经挂载到/u01目录
5、把挂载信息放入fstab里
[root@bidw tmp]# cat /etc/fstab "/etc/fstab" 19L, 979C# # /etc/fstab # Created by anaconda on Sat Dec 29 12:06:41 2012 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=bcc682b0-5a55-4df8-8f7f-2ebfca7e0bf9 / ext4 defaults 1 1 UUID=f75b95fb-78cf-4070-b629-a5b1983edc83 /boot ext4 defaults 1 2 UUID=5743454b-f226-4c7c-8ad4-bf8db690572b /data xfs defaults 1 2 UUID=e9ea4e7a-d959-4c63-a562-dc059d58ac08 swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults,size=16G 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/sdb1 /data ext3 defaults 0 0
然后对最新的配置生效一下
[root@bidw tmp]# mount -a [root@bidw tmp]# mount /dev/sda3 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,size=16G) /dev/sda1 on /boot type ext4 (rw) /dev/sda5 on /data type xfs (rw) /dev/sdb1 on /data type ext3 (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) none on /sys/kernel/config type configfs (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) /dev/sdc1 on /u01 type ext4 (rw)
6、测试一下新分区对象
[root@bidw tmp]# cd /u01 [root@bidw u01]# ll total 16 drwx------ 2 root root 16384 Jul 21 09:49 lost+found [root@bidw u01]# touch test [root@bidw u01]# ll total 16 drwx------ 2 root root 16384 Jul 21 09:49 lost+found -rw-r--r-- 1 root root 0 Jul 21 10:03 test [root@bidw u01]# rm test rm: remove regular empty file `test'? y
三、parted分区（2T容量以上硬盘使用）
1、查看分区情况
root@ip-10-10-27-116:/home 02:36:30 # fdisk -l Disk /dev/sda: 999.7 GB, 999653638144 bytes 255 heads, 63 sectors/track, 121534 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: 0x00045789 Device Boot Start End Blocks Id System /dev/sda1 * 1 131 1048576 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 131 4309 33554432 82 Linux swap / Solaris /dev/sda3 4309 121535 941620224 83 Linux Disk /dev/sdb: 2999.0 GB, 2998960914432 bytes 255 heads, 63 sectors/track, 364602 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: 0x00000000
可以看到/dev/sdb是需要分区的，磁盘容量为3t，fdisk没办法分区，只能使用parted进行gpt分区了
下面是当前已经在用的磁盘情况
root@ip-10-10-27-116:/home 02:38:04 # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 884G 2.0G 838G 1% / tmpfs 32G 0 32G 0% /dev/shm /dev/sda1 1008M 56M 902M 6% /boot
2、使用parted进行分区
root@ip-10-10-27-116:/home 02:38:06 # parted /dev/sdb GNU Parted 2.1 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Error: /dev/sdb: unrecognised disk label (parted) mklabel gpt (parted) mkpart primary 0% 100% (parted) print Model: DELL PERC H710P (scsi) Disk /dev/sdb: 2999GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 2999GB 2999GB primary (parted) quit Information: You may need to update /etc/fstab.
介绍一下各个命令的意思 p 是打印磁盘信息，查看分区的情况，找到起始和结束位置。 mklabel gpt 是进行gpt类型分区 mkpart primary 0% 100% 是primary指分区类型为主分区，0是分区开始位置，100%是分区结束位置。相同的命令为：mkpart primary 0-1 或者是：mkpart primary 0 XXXXXX结束的空间 print 打印当前分区,查看分区设置是否正确 quit 退出
查看磁盘分区情况
02:44:07 # fdisk -l Disk /dev/sda: 999.7 GB, 999653638144 bytes 255 heads, 63 sectors/track, 121534 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: 0x00045789 Device Boot Start End Blocks Id System /dev/sda1 * 1 131 1048576 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 131 4309 33554432 82 Linux swap / Solaris /dev/sda3 4309 121535 941620224 83 Linux WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdb: 2999.0 GB, 2998960914432 bytes 255 heads, 63 sectors/track, 364602 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: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 1 267350 2147483647+ ee GPT
可用看到/dev/sdb1已经进行了gpt类型分区
3、格式化为ext4系统
02:44:12 # mkfs.ext4 /dev/sdb1 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 183042048 inodes, 732167680 blocks 36608384 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296 22344 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 102400000, 214990848, 512000000, 550731776, 644972544 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 30 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. root@ip-10-10-27-116:/home 02:47:23 # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 884G 2.0G 838G 1% / tmpfs 32G 0 32G 0% /dev/shm /dev/sda1 1008M 56M 902M 6% /boot
4、挂载
创建挂载目录data
oot@ip-10-10-27-116:/home 02:49:38 # mkdir /data 然后挂载/dev/sdb1到/data目录 root@ip-10-10-27-116:/home 02:50:36 # mount /dev/sdb1 /data root@ip-10-10-27-116:/home 02:50:41 # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 884G 2.0G 838G 1% / tmpfs 32G 0 32G 0% /dev/shm /dev/sda1 1008M 56M 902M 6% /boot /dev/sdb1 2.7T 201M 2.6T 1% /data
5、加入fstab
root@ip-10-10-27-116:/home 02:51:39 # cat /etc/fstab # # /etc/fstab # Created by anaconda on Wed Aug 27 13:39:16 2014 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=1bc74b58-1fbe-4f65-9790-d02abc23d461 / ext4 defaults 1 1 UUID=ebbbaa89-e509-4fef-8763-be6eed9408c7 /boot ext4 defaults 1 2 UUID=98417724-a1c5-4f9a-9750-85beda11e4e1 swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/sdb1 /data ext4 defaults 0 0
生效一下
02:51:43 # mount -a root@ip-10-10-27-116:/home 02:51:45 # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 884G 2.0G 838G 1% / tmpfs 32G 0 32G 0% /dev/shm /dev/sda1 1008M 56M 902M 6% /boot /dev/sdb1 2.7T 201M 2.6T 1% /data
6、测试
11:04:13 # cd /data root@ip-10-10-27-116:/data 11:06:44 # echo "this is test">test root@ip-10-10-27-116:/data 11:06:52 # cat test this is test root@ip-10-10-27-116:/data 11:06:54 # rm test rm: remove regular file `test'? y root@ip-10-10-27-116:/data
