The tape thing doesn't do a thing because DD drives don't have a sensor on that side. I remember tape on 5 1/4" floppies making them write-protected, and doing tape on the other side protected the back side of the disk in the same way. One thing you could try is drilling a hole in a DD disk and seeing if it will work in an HD drive. I remember people trying that a long time ago. Dunno what the results were.
