add HFS+ partitions to external drive with NTFS partitions

the title says it all. I have a 300gb external drive with 2 NTFS partitions with important information on them. Is there a way to add a HFS/HFS+ partition to the drive without removing, or corrupting/damaging the NTFS partitions (the NTFS partitions were made in Windows XP)?

When I try to create a new partition using iPartition, it says:

iPartition could not find a partition map on this drive.

This may be because the disk is empty, or it may be because the partition map on the disk is not in a format that iPartition recognises.

To create a new partition map, select the type of map you require and click "Create Partition Map", below.

It gives me the option to choose either Apple or GUID partition map types. I don't want to screw up the NTFS partitions already on the drive. Will creating an Apple Partition Map erase the Master Boot Record (MBR) made by Windows?

 

Ok I did a bit of fiddling around and searching for info and it seems as though I was using an old version of iPartition (v1.5.0 or something ). I got version 3 and I was able to do everything I needed! I also read that you cannot repartition any drive while logged into osx -- which I find really weird. That's why all the options in the partition tab of Disk Utility were disabled.

So anyways, I was able to keep the NTFS partitions, delete the FAT32 partitions and add an HFS+ partition so I could restore a DMG to it.