If you open a root shell and type: fdisk -l, and post the output here, (This will not do anything to the drive, just attempt to list the partitions).

You could also try running gpart -v, which will not do anything but attempt to find the partitions on the drive, and post the output here. gpart usually takes a long time to finish - a couple hours is not unusual.

If the drive has been making alot of loud clicking noises as you do things, it is probably mechanically broken, and you will have to send it out.

Finally, if you can log onto IRC, there is a #knoppix channel on freenode where you might be able to get real time help.