I'm not familiar with the ubcd but it doesn't look like it wiped your drive,

From a root shell in knoppix type dd if=/dev/zero of=/dev/hda, and wait until it finishes, which could be a while depending on the size of the drive. That will hose the drive completely. Then try creating a partition with fdisk or qtparted and see if it works.

Remember to write a new empty DOS partition table ( option o in fdisk) before creating the partitions and writing the table to disk.

HTH