Deleting an NTFS Partition from DOS
If you ever need to delete an NTFS partition from DOS, the Windows NT 3.1 Resource Kit has the solution. Download the kit, extract the DELPART.EXE utility to a DOS boot disk, boot from the disk and then run the utility. It's self-explanatory from there.
I wonder why this utility is no longer in the Resource Kits?
Note: I kept getting a “Page Not Found” error while trying to download the resource kit, but it eventually worked.