How to back up restore and view hard disk MBR and partition table under Linux

The Master boot record (master boot RECORD,MBR) is located on a hard disk with 0 cylinders, 0 disk faces, and 1 sectors, total 512 bytes. The specific divisions are: Boot code area 440 bytes, disk signature 4 bytes, white space (Ox0000) 2 bytes, MBR partition table (Disk Partition table,dpt) 64 bytes, end flag (OX55AA) 2 bytes. The MBR partition table (DPT) differs from another "Globally unique identity partition table (GUID Partition table,gpt)". This article discusses only MBR and DPT today.

Needless to say, the following first describes how to back up, restore MBR and DPT:

Backup/restore HDD MBR (all 512 bytes):

#备份 #  DD if=/dev/sda of=/mbr.bak bs=512 count=1# Recovery #  DD If=/mbr.bak OF=/DEV/SDA bs=512 count=1

Partition Table DPT (after 66 bytes) for backup/restore only disks:

#备份 #  DD if=/dev/sda of=/dpt.bak bs=1 skip=446 count=66# Recovery #  DD if=/dpt.bak OF=/DEV/SDA bs=1 seek=446 count=66

Recover only the boot code portion of the hard disk mbr (first 446 bytes):

#恢复 #  DD if=/mbr.bak OF=/DEV/SDA bs=446 count=1

After you have backed up the MBR, you can use the OD command to view the contents of the backed up MBR. The command is as follows:

[Email protected]/]# od-x Mbr.bak 0000000 48eb 1090 d08e 00BC b8b0 0000 d88e c08e 0000020 befb 7c00 00bf b906 0200 a4f3 21ea 0006 0000040 be00 07be 0438 0b75 c683 8110 fefe 7507 0000060 ebf3 b416 b002 bb01 7c00 80b2 748a 0203 0000100 0080 8000 615a 0000 0800 90FA f690 80c2 0000120 0275 80b2 59ea 007c 3100 8ec0 8ed8 bcd0 0000140 a0fb 7c40 ff3c 0274 c288 f652 80c2 0000160 5474 41b4 aabb cd55 5a13 7252 8149 55FB 0000200 75aa a043 7c41 c084 0575 e183 7401 6637 0000220 4c8b be10 7c05 44c6 01ff 8b66 441e c77c 0000240 1004 c700 0244 0001 8966 085c 44c7 0006 0000260 6670 c031 4489 6604 4489 b40c cd42 7213 0000300 bb05 7000 7deb 08b4 13cd 0a73 c2f6 0f80 0000320 f084 e900 008d 05be c67c ff44 6600 c031 0000340 f088 6640 4489 3104 88d2 c1ca 02e2 e888 0000360 f488 8940 0844 c031 d088 e8c0 6602 0489 0000400 a166 7c44 3166 66d2 34f7 5488 660a d231 0000420 f766 0474 5488 890b 0c44 443b 7d08 8a3c 0000440 0d54 e2c0 8a06 0a4c c1fe d108 6c8a 5a0c 0000460 748a bb0b 7000 c38e db31 01b8 cd02 7213 0000500 8c2a 8ec3 4806 607c b91e 0100 db8e f631 0000520 ff31 f3fc 1fa5 ff61 4226 be7c 7d7f 40e8 0000540 eb00 be0e 7d84 38e8 eb00 be06 7d8e 30e8 0000560 be00 7d93 2ae8 eb00 47fe 5552 2042 4700 0000600 6f65 006d 6148 6472 4420 7369 006b 6552 0000620 6461 7245 6f72 0072 01bb b400 cd0e 0000640 ac10 003c f475 00c3 0000 0000 0000 0000 0000660 0000 0000 0000 0000 5dd6 0001 0000 2080 0000700 0021 9f83 1906 0800 0000 4000 0006 9F00 0000720 1907 8383 16ed 4800 0006 8000 00BB 8300 0000740 16ee fe82 ffff c800 00c1 0000 0040 9800 0000760 1b3e d405 32a2 c800 0101 3800 017e Aa55 0001000 [Email protected]/]#

How to back up restore and view hard disk MBR and partition table under Linux