Re: It is possible to produce an idiot proof interface.
In the early 90s I worked for a company who had systems in John Menzies shops ( UK high street newspaper, stationery, music, books, computer games seller ) across the country that produced copies of 8 bit home computer games on demand.
The system was just a 286 in a custom case with drives such as 3.5", 5.25", cassette drive and amstrad 3" in bays on the front, plus a bunch of blanked off spare bays for future expansion.
We used to send out updates on 3.5" floppy disk and the users were supposed to put the disk in the drive then select an update function from an admin menu in the system software and follow the prompts. Should be pretty simple but, when the first update went out we got lots of calls from shop staff saying they were getting disk not present errors or something like that.
After a lot of head scratching it turned out that they were forcing the disk into the gap between the drive bay blanking plates rather than into the drive itself!