看到许多人因丢失分区而苦恼，只能说备份分区表是王道，而不是在丢失分区信息之后用各种工具软件想办法恢复分区表，写这个帖子顺便也把自己的分区表做个备份。
方法1.不推荐
代码:
sudo fdisk -lu
引用:
Disk /dev/sda: 163.9 GB, 163928604672 bytes
255 heads, 63 sectors/track, 19929 cylinders, total 320173056 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xac1174d9
Device Boot Start End Blocks Id System
/dev/sda1 * 63 41945714 20972826 7 HPFS/NTFS/exFAT
/dev/sda2 41945715 104872319 31463302+ 7 HPFS/NTFS/exFAT
/dev/sda3 104872320 167782859 31455270 7 HPFS/NTFS/exFAT
/dev/sda4 167782921 320172031 76194555+ 5 Extended
/dev/sda5 167782923 188747684 10482381 b W95 FAT32
/dev/sda6 188747748 226484369 18868311 83 Linux
/dev/sda7 226484433 247449194 10482381 83 Linux
/dev/sda8 247449258 251642159 2096451 82 Linux swap / Solaris
/dev/sda9 251643904 290705407 19530752 83 Linux
/dev/sda10 290707456 320172031 14732288 83 Linux
Disk /dev/sdb: 41.1 GB, 41110142976 bytes
255 heads, 63 sectors/track, 4998 cylinders, total 80293248 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ac225
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 80292869 40145411 83 Linux
如果分区出现问题，利用上面信息，用下面命令按启止扇区可恢复分区表：
代码:
sudo fdisk -u /dev/sda
sudo fdisk -u /dev/sdb
第一种办法太多手工操作，可能输入错误的启止扇区。
方法2：推荐
http://www.ducea.com/2006/10/09/partition-table-backup/把分区表备份到文本文件：
代码:
sudo sfdisk -d /dev/sda > sda_table
把sda_table内容贴到论坛或保存到u盘，注意不能存放在以后要恢复分区表的硬盘：
引用:
# partition table of /dev/sda
unit: sectors
/dev/sda1 : start= 63, size= 41945652, Id= 7, bootable
/dev/sda2 : start= 41945715, size= 62926605, Id= 7
/dev/sda3 : start=104872320, size= 62910540, Id= 7
/dev/sda4 : start=167782921, size=152389111, Id= 5
/dev/sda5 : start=167782923, size= 20964762, Id= b
/dev/sda6 : start=188747748, size= 37736622, Id=83
/dev/sda7 : start=226484433, size= 20964762, Id=83
/dev/sda8 : start=247449258, size= 4192902, Id=82
/dev/sda9 : start=251643904, size= 39061504, Id=83
/dev/sda10: start=290707456, size= 29464576, Id=83
从文本文件中恢复分区表：
代码:
sudo sfdisk /dev/sda < sda_table
3.很多工具软件都提供备份和恢复分区表，比如DiskGenius软件，注意把备份保存到u盘。
http://www.diskgenius.cn/help/ptbackup.asp
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