Afraid you might mess up your MBR? Back up the bootsector:
dd if=/dev/hda of=bootsector.img bs=512 count=1
If anything goes wrong, you can boot from a LiveCD and restore the bootsector with
dd if=bootsector.img of=/dev/hda
![](http://img.zemanta.com/pixy.gif?x-id=c17231f0-4702-493a-8ea3-9d7fd92364bc)
Afraid you might mess up your MBR? Back up the bootsector:
dd if=/dev/hda of=bootsector.img bs=512 count=1
If anything goes wrong, you can boot from a LiveCD and restore the bootsector with
dd if=bootsector.img of=/dev/hda
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