请教如何使用dd命令备份MBR和引导区

strangeryf

系统是winxp+win2k3+FC2,  用NTOSLDR引导, 每次重装xp后2k3不能引导, 用紧急恢复控制台中的fixmbr和fixboot都不解决问题. 由于是NTFS的文件系统, 没有找到较好的备份工具. 突然想到我的linux的引导区的dump是用dd做的, 不知能否也用dd来备份MBR和C盘引导区. :help

frenzy

Example:
MBR
dd if=/dev/hda of=<backup file> bs=512 count=1

Boot Sector (not sure):
# dd if=/dev/hda1 of=<backup file> bs=512 count=1

Take a look at this article:
http://mandrakeusers.org/index.php?showtopic=16804

google keyword:
dd backup mbr

aaccdd

For mbr backup to floppy:
dd if=/dev/hda of=/dev/fd0 bs=512 count=1
Floppy will boot like the hd does.
For bootsector backup:
dd if=/dev/[partition] of=/dev/fd0 bs=512 count=1
Floppy will boot like partition does.
For backup of either to file (mbr in this case):
dd if=/dev/hda of=/mbr.bak bs=512 count=1
If you want to copy back to hd, keep in mind that parititon info is in the first 16 bytes of the mbr, you will need to skip it if you don't want new partition data overwritten.

http://www.linuxquestions.org/qu ... d=853241#post853241

strangeryf

收到. 突然发现, 不好把备份文件写回去. 难道要用WinHex?

aaccdd

If you want to copy back to hd, keep in mind that parititon info is in the first 16 bytes of the mbr, you will need to skip it if you don't want new partition data overwritten