Effective immediately, I will no longer be supporting Autoclave, a floppy-based hard drive erasing utility, except in the case of University of Washington staff, faculty and students who are used to using Autoclave and need help with the transition to a different product.
I recommend the use of Darik's Boot And Nuke (DBAN) rather than Autoclave. DBAN has much better hardware support, better customization options, a better selection of erase methods, and a better user interface. It is better than Autoclave in all respects I can think of, and I say that as the author of Autoclave.
University of Washington community, please note: The UW's computer disposal policy requires that you use a "three pass binary overwrite" method to securely erase data on any media sent to surplus. To do this in DBAN, either use one round of the "DoD Short" method or three rounds of the "PRNG Stream" method. In either case, I recommend the "Verify: Last Pass" option, although the disposal policy doesn't explicitly call for it.
The old web pages for Autoclave can be found here, if for some reason you need them.