@ Comment #1:

You can prevent that by launching the Open Firmware Utility and setting it to require a password before modifying the startup disk (and hence preventing a HDD wipe.)

Downside to that: forget the password, need to reinstall the OS, and you're SOL.

d12 for 12-tone music? How 1980's. If you really want to be out there, create a d43 to play some of Harry Partch's works.