I have an external hard drive that plugs into my USB port. Knoppix assigns the device /dev/uba1 to it. When I try to scan the drive using the command "gpart /dev/uba1", I receive the message "*** Fatal error: ioctl(HDIO_GETGEO) failed: Inappropriate ioctl for device."

I accidentally deleted the primary NTFS partition on this drive and I'm trying to re-create it. Can gpart help me with this? What do I need to do?