"Those of you who remember floppies will remember they came with a tiny switch that could write-protect the media. Steve knew of this switch and as he attempted to sort out this problem told the user to move the disk lock down."
Are we conflating disk sizes here? I remember 3.5" floppies having a switch to write-protect them, but I don't remember 3.5" floppy drives having a disk lock you needed to flick/turn down. Equally I remember 5.25" floppies having a disk lock on the drive, but they didn't have switches for write protection, it was a good ol' hole-punch and/or sticky tape for that.