I've heard that it is best to use opaque tape or electrical tape when tapeing the hole in a 1.4MB floppy. Apparantly some Macs use optical sensors to check for 800K/1.4MB disks and clear tape won't block out the light. I used to use this trick with my Plus and it worked alright in most cases. However I was lucky enough to get a big box of 720K floppies for free so I use those now.