a) What make is your HDD?
b) What OS are you using (and is it a branded pc..if so which)?
c) Are you using FDisk (from a 98/me floppy) or the utility found on an XP Cd (which is NOT FDisk at all)?
d) Be aware of hidden partitions etc. if wiping your HDD and only have recovery CD's!
Go ahead and use/do anything you want........there is no right and wrong (and no-one but you will lose any sleep if you balls things up.....).