Ok to change partition sizes when restoring to factory setting?

Quick question before I start.

Is it ok to screw around with the partition sizes. Right now I have a 100Gb and a 6GB drive, they are not the restore partitions or anything. I want to have like 50GB and a 56GB partition, one for Vista, one for XP.

But this is what he manual says from page 71, here http://support.toshiba.ca/support/techsupport/center/main.asp?displaytype=manual )
"If you subsequently set up your hard disk drive again, do not change, delete
or add partitions in a manner other than specified in the manual, otherwise
you may find that space for the required software is not available.

In addition, if you use a third-party partitioning program to reconfigure the
partitions on your hard disk drive, you may find that it becomes impossible
to setup your computer."

I think it should be ok to change them, whats your thought on this?
Or if you've done this before, please comment.
Thanks.

 

I think you should be fine, just use the vista manager to shrink your vista partition to whatever size you want and then format the newly created partition for XP and you should be good to go. the vista factory install is well below 50gb so no worries there. you should also be able to make use of that extra 6gb with vista manager, just make sure you know what its being used for before you change it