Step 1 : Login as a root user.
# dd if=/dev/hda of=/dev/fd0 bs=512 count=1
This makes an exact copy of the MBR of the first hard drive (hda - you need to replace this), copying it to a floppy disk. You can boot directly from this floppy, and see your old boot menu. You can restore it by switching the “if=” and “of=” (input file, output file) parameters.
If you don’t have a floppy drive, you can back it up to a file using below command. # dd if=/dev/hda of=/home/Username/boot.mbr bs=512 count=1 Use your Linux distribution’s installation CD to boot into rescue mode and restore it with below command. # dd if=/mnt/hda5/Username/boot.mbr of=/dev/hda bs=512 count=1
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