Resizing ntfs partition

[Nicholas Leippe]

On Monday 26 February 2007 15:51, Kelly Terry wrote:
> I was going to install Fedora on a friends computer.  He has windows xp
> pro installed so I defragmented the drive.  He's using only about 5 gb
> of a 75 gb hard drive.  The graphic showed a lot  (at least 20gb) of
> unused space at the end of the drive after defragmenting.  If I use the
> tool that comes with mandriva for shrinking the ntfs partition by 10 gb
> to install linux will that render the windows ntfs partition unusable?
> I've done this with fat 32 file systems with no problem many times
> before but never on an ntfs partition.  There's really no important
> data to back up - just the windows install with drivers and very little
> software.  Still my friend is nervous and doesn't want to risk a
> windows reinstall.

Just curious, how does "no important data to back up - just the windows 
install with drivers and very little software." consume nearly 55GB ?