I have seen one case like this, too. Every week, the customer put a tape into the drive, the machine did something with the tape, but apparently not what it was

I have seen one case like this, too. Every week, the customer put a tape into the drive, the machine did something with the tape, but apparently not what it was supposed to do. So when the application running on that machine managed to scramble its (FoxPro) database, they were quite surprised to find their tapes empty. I was really happy I did not have to work on that case. ;-)