I recently was surprised to learn that Target Disk Mode doesn't prompt for a password, even if a password is normally required to log in to that computer. So after doing some research I've come to realize that in order to fully secure the data on my machine I will need to set an open firmware password. This page explains the process for setting such a password. http://support.apple.com/kb/HT1352 But if I do this is it going to prompt me for the firmware password in addition an account password every time I start up my computer? Because that would be annoying. Also, is there anything else I should know before going ahead with this? I find it strange that it's not a setting that can be changed in System Prefs, and even more unusual that (in Leopard at least) it requires booting from the install disc to set the password. Am I understanding this correctly?