This reminds me many years ago of my PC inexperience. If you left a floppy disk drive in the PC and booted it up you got a message saying something like disc not found. It used to scare the hell out of me thinking I'd borked the PC. Of course, the local PC know-it-all would remove the floppy, boot up the PC and look at you as if you've just moved up a stage from pond life. I must have done it at least 3 times before I clicked.