How to erase Linux?

[Dan Steeves]

Gianmarco Leone wrote:
> Anyway, i don't think it will be enough. You should remember of grub.
> You have to recover first your MBR (using fdisk /mbr in the dos prompt,
> i suppose), and then resize your windows partition to take the entire
> disk.

I made this mistake once.  Decided I wanted them back so I reformatted 
my Linux partitions as ntfs from Windows.  Grub lost its info from my / 
partition and I couldn't boot into anything.  I fixed it by 
re-installing Ubuntu into a very small partition, then setting Win XP as 
my default OS in Grub.

If you know how to recover your MBR that sounds like the best option. 
If you don't, then you can always re-install Ubuntu to a very small 
partition, and reformat the other ones from Windows like I did.