HDInstTool is a Harddisk Installation Tool.
This is a great alternative to Commodore's original HDToolkit partitioning software. InstTool is much easier to use that HDToolkit and it recognises larger HDs, reporting total HD space and partition sizes correctly, making it safer to use larger HDs over 4GB with your Amiga (as long as you use a supporting file system). It has built in facilities to handle third party file systems and can also format partititons and copy HD backups onto a newly formatted disk.