I looked into it at one time and it explained that ComputerGuardian's uses Apple's Open Firmware password to effectively lock out anyone trying to reformat the drive. http://www.macdevcenter.com/pub/a/mac/2003/02/18/secure_tibook.html On Apr 20, 2004, at 1:47 PM, robert at elastica.com wrote: > I have some phone home stuff on my machine but honestly how does it > work if a a > Thief cannot access the machine and therefore has to reformat the drive > anyway?