format the previously installed xp from ubuntu

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http://www.linuxquestions.org – I am using xp and ubuntu 9.10 in dual boot mode. Previously when i formatted my xp and reinstalled it the mbr was changed and this the grub did'nt loaded up. Well i am out of that problem but now i want to format the xp from my linux i.e i don't want any other os in this hard disk apart from linux (ubuntu 9.10) so is it possible to format the xp from linux. will it affect the mbr ? and if yes then wat is the solution for it ? also the drive containing xp should be available for my storage purpose afterwards. thank you. (HowTos)