破坏64位分区表，将其恢复

1、[root@xiqukeke ~]# hexdump -C -n 512 /dev/sda
00000000 eb 63 90 10 8e d0 bc 00 b0 b8 00 00 8e d8 8e c0 |.c..............|
00000010 fb be 00 7c bf 00 06 b9 00 02 f3 a4 ea 21 06 00 |...|.........!..|
00000020 00 be be 07 38 04 75 0b 83 c6 10 81 fe fe 07 75 |....8.u........u|
00000030 f3 eb 16 b4 02 b0 01 bb 00 7c b2 80 8a 74 01 8b |.........|...t..|
00000040 4c 02 cd 13 ea 00 7c 00 00 eb fe 00 00 00 00 00 |L.....|.........|
00000050 00 00 00 00 00 00 00 00 00 00 00 80 01 00 00 00 |................|
00000060 00 00 00 00 ff fa 90 90 f6 c2 80 74 05 f6 c2 70 |...........t...p|
00000070 74 02 b2 80 ea 79 7c 00 00 31 c0 8e d8 8e d0 bc |t....y|..1......|
00000080 00 20 fb a0 64 7c 3c ff 74 02 88 c2 52 be 05 7c |. ..d|<.t...R..||
00000090 b4 41 bb aa 55 cd 13 5a 52 72 3d 81 fb 55 aa 75 |.A..U..ZRr=..U.u|
000000a0 37 83 e1 01 74 32 31 c0 89 44 04 40 88 44 ff 89 |[email protected]..|
000000b0 44 02 c7 04 10 00 66 8b 1e 5c 7c 66 89 5c 08 66 |D.....f..|f..f|
000000c0 8b 1e 60 7c 66 89 5c 0c c7 44 06 00 70 b4 42 cd |..|f.\..D..p.B.|<br/>000000d0 13 72 05 bb 00 70 eb 76 b4 08 cd 13 73 0d 5a 84 |.r...p.v....s.Z.|<br/>000000e0 d2 0f 83 de 00 be 85 7d e9 82 00 66 0f b6 c6 88 |.......}...f....|<br/>000000f0 64 ff 40 66 89 44 04 0f b6 d1 c1 e2 02 88 e8 88 |[email protected]..........|<br/>00000100 f4 40 89 44 08 0f b6 c2 c0 e8 02 66 89 04 66 a1 |[email protected].|<br/>00000110 60 7c 66 09 c0 75 4e 66 a1 5c 7c 66 31 d2 66 f7 ||f..uNf.|f1.f.|
00000120 34 88 d1 31 d2 66 f7 74 04 3b 44 08 7d 37 fe c1 |4..1.f.t.;D.}7..|
00000130 88 c5 30 c0 c1 e8 02 08 c1 88 d0 5a 88 c6 bb 00 |..0........Z....|
00000140 70 8e c3 31 db b8 01 02 cd 13 72 1e 8c c3 60 1e |p..1......r....|<br/>00000150 b9 00 01 8e db 31 f6 bf 00 80 8e c6 fc f3 a5 1f |.....1..........|<br/>00000160 61 ff 26 5a 7c be 80 7d eb 03 be 8f 7d e8 34 00 |a.&Z|..}....}.4.|<br/>00000170 be 94 7d e8 2e 00 cd 18 eb fe 47 52 55 42 20 00 |..}.......GRUB .|<br/>00000180 47 65 6f 6d 00 48 61 72 64 20 44 69 73 6b 00 52 |Geom.Hard Disk.R|<br/>00000190 65 61 64 00 20 45 72 72 6f 72 0d 0a 00 bb 01 00 |ead. Error......|<br/>000001a0 b4 0e cd 10 ac 3c 00 75 f4 c3 00 00 00 00 00 00 |.....&lt;.u........|<br/>000001b0 00 00 00 00 00 00 00 00 bb 72 0d 00 00 00 80 20 |.........r..... |<br/>000001c0 21 00 83 aa 28 82 00 08 00 00 00 00 20 00 00 aa |!...(....... ...|<br/>000001d0 29 82 83 fe ff ff 00 08 20 00 00 00 40 06 00 fe |)....... ...@...|<br/>000001e0 ff ff 82 fe ff ff 00 08 60 06 00 00 40 00 00 fe |...........@...|
000001f0 ff ff 05 fe ff ff 00 08 a0 06 00 f8 5f 12 55 aa |............_.U.|
00000200
2、[root@xiqukeke ~]# dd if=/dev/sda of=/data/mbr bs=1 count=512
512+0 records in
512+0 records out
512 bytes (512 B) copied, 0.00858063 s, 59.7 kB/s
3、[root@xiqukeke ~]# hexdump -C -n 512 /dev/sda
00000000 eb 63 90 10 8e d0 bc 00 b0 b8 00 00 8e d8 8e c0 |.c..............|
00000010 fb be 00 7c bf 00 06 b9 00 02 f3 a4 ea 21 06 00 |...|.........!..|
00000020 00 be be 07 38 04 75 0b 83 c6 10 81 fe fe 07 75 |....8.u........u|
00000030 f3 eb 16 b4 02 b0 01 bb 00 7c b2 80 8a 74 01 8b |.........|...t..|
00000040 4c 02 cd 13 ea 00 7c 00 00 eb fe 00 00 00 00 00 |L.....|.........|
00000050 00 00 00 00 00 00 00 00 00 00 00 80 01 00 00 00 |................|
00000060 00 00 00 00 ff fa 90 90 f6 c2 80 74 05 f6 c2 70 |...........t...p|
00000070 74 02 b2 80 ea 79 7c 00 00 31 c0 8e d8 8e d0 bc |t....y|..1......|
00000080 00 20 fb a0 64 7c 3c ff 74 02 88 c2 52 be 05 7c |. ..d|<.t...R..||
00000090 b4 41 bb aa 55 cd 13 5a 52 72 3d 81 fb 55 aa 75 |.A..U..ZRr=..U.u|
000000a0 37 83 e1 01 74 32 31 c0 89 44 04 40 88 44 ff 89 |[email protected]..|
000000b0 44 02 c7 04 10 00 66 8b 1e 5c 7c 66 89 5c 08 66 |D.....f..|f..f|
000000c0 8b 1e 60 7c 66 89 5c 0c c7 44 06 00 70 b4 42 cd |..|f.\..D..p.B.|<br/>000000d0 13 72 05 bb 00 70 eb 76 b4 08 cd 13 73 0d 5a 84 |.r...p.v....s.Z.|<br/>000000e0 d2 0f 83 de 00 be 85 7d e9 82 00 66 0f b6 c6 88 |.......}...f....|<br/>000000f0 64 ff 40 66 89 44 04 0f b6 d1 c1 e2 02 88 e8 88 |[email protected]..........|<br/>00000100 f4 40 89 44 08 0f b6 c2 c0 e8 02 66 89 04 66 a1 |[email protected].|<br/>00000110 60 7c 66 09 c0 75 4e 66 a1 5c 7c 66 31 d2 66 f7 ||f..uNf.|f1.f.|
00000120 34 88 d1 31 d2 66 f7 74 04 3b 44 08 7d 37 fe c1 |4..1.f.t.;D.}7..|
00000130 88 c5 30 c0 c1 e8 02 08 c1 88 d0 5a 88 c6 bb 00 |..0........Z....|
00000140 70 8e c3 31 db b8 01 02 cd 13 72 1e 8c c3 60 1e |p..1......r....|<br/>00000150 b9 00 01 8e db 31 f6 bf 00 80 8e c6 fc f3 a5 1f |.....1..........|<br/>00000160 61 ff 26 5a 7c be 80 7d eb 03 be 8f 7d e8 34 00 |a.&Z|..}....}.4.|<br/>00000170 be 94 7d e8 2e 00 cd 18 eb fe 47 52 55 42 20 00 |..}.......GRUB .|<br/>00000180 47 65 6f 6d 00 48 61 72 64 20 44 69 73 6b 00 52 |Geom.Hard Disk.R|<br/>00000190 65 61 64 00 20 45 72 72 6f 72 0d 0a 00 bb 01 00 |ead. Error......|<br/>000001a0 b4 0e cd 10 ac 3c 00 75 f4 c3 00 00 00 00 00 00 |.....&lt;.u........|<br/>000001b0 00 00 00 00 00 00 00 00 bb 72 0d 00 00 00 80 20 |.........r..... |<br/>000001c0 21 00 83 aa 28 82 00 08 00 00 00 00 20 00 00 aa |!...(....... ...|<br/>000001d0 29 82 83 fe ff ff 00 08 20 00 00 00 40 06 00 fe |)....... ...@...|<br/>000001e0 ff ff 82 fe ff ff 00 08 60 06 00 00 40 00 00 fe |...........@...|
000001f0 ff ff 05 fe ff ff 00 08 a0 06 00 f8 5f 12 55 aa |............_.U.|
00000200
[root@xiqukeke ~]# ll /data/mbr
-rw-r--r-- 1 root root 512 Feb 10 22:15 /data/mbr
4、将数据拷贝走
[root@xiqukeke ~]# scp /data/mbr 192.168.141.130:/data
[email protected]'s password:
mbr 100% 512 464.9KB/s 00:00
5、[root@xiqukeke ~]# dd if=/dev/zero of=/dev/sda bs=1 count=64 skip=446 seek=44664+0 records in
64+0 records out
64 bytes (64 B) copied, 0.000504458 s, 127 kB/s
[root@xiqukeke ~]# fdisk -l /dev/sda

Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 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 label type: dos
Disk identifier: 0x000d72bb

Device Boot Start End Blocks Id System
6、reboot
7、进入救援模式，出现开机滚动条时，迅速按esc键，选择第三项：CD-ROM Drive，选择第三项：Troubleshooting，选择第二项：Rescue a CentOS system,当出现 Please make a selection from the above：【1】 出现 Please press <return> to get a shell时，按回车键，出现“ sh-4.2# ”，此时“ df ”发现无/sda,我们添加网络，centos7的ens33的ip192.168.141.254添加上，scp 192.168.141.130：/data/mbr .拷贝到当前目录下，ls --> 当前目录下有 mbr ，接着，dd if=mbr of=/dev/sda 即可还原分区表，exit后就能重新恢复数据，完成修复。