Wow Scleros, Thanks for going to all the trouble to test this for me.
NeedKarma sent me a link to the User's Manual:
http://www.killdisk.com/downloads/KillDisk_Win5.pdf
"Can you erase secondary or external drives?"
It appears that if you can see the drive, you can nuke it. (see 3.2.1, pgs 12 & 13, steps 1-3). Page 8 of Operator's Manual says "Supports fixed disks, floppies, zip drives, USB devices (ext drives)".
The manual talks about burning a bootable CD, but that may only be needed if you plan to erase the main drive (0). If you plan to erase a secondary or external drive, it seems that you can download the program into the “programs menu”.
(see 3.2.1, step 1, page 12).
Cautionary note on page 17 about Master Boot Record (MBR).
The version of Kill Disk on cnet downloads appears to list all internal and external drives, and allows you to select which one to nuke.
Sounds like a great utility. I have a drive I plan to try it on soon. Hope I don't end up deleting my drive 0 (Yikes!)