I've not heard of this and I've been on this board for almost 10 years. I really don't see how HP/Compaq could create such a scheme that would prevent a partition manager software from modifying the partition(s) on a hard drive.
It's very possible that it's true but.... I've not heard or read about this before.
Just be careful and don't delete or modify the small 10 gb partition as that's where the restore files are stored.
Some informative links:
If this one doesn't work, let me know and I'll find additional programs.