XP Utility "Computer Management" Question

[NeedaComputer]

I was referred to a site from a thread posted recently. It told of an XP Utility called "Computer Management". In this utility you can partition drives etc. At the end of the article it states not to use this utility to do anything to an existing drive.
I have a 250GB Sata, that I originally only allocated 150GB for XP, and planned the other 100 for something else.
Well, now I want that 100GB for my XP. Can I partition the unallocated 100GB into a usable drive and not risk any dataloss from my current 150GB partition?
Thank you.

 

[The_Other_One]

You should be fine just working with the unused space. However, I'd still be sure to back up your data. Though nothing bad should happen, you can never be too safe...