Here's what you need to do to get reliable results from Apple drives:
  And I am probably a good test of real world abuse to
the Apple Drive ][
 drives, as I was just a wee child, and I didn't follow any rules that I
 probably should have. (I always put the disk in the drive, closed it, and
 turned on the computer... I would pull disks out, and replace them while
 the drive was reading or writing, I would power off the computer or reset
 it during read/write, I didn't use dust sleaves, I touched the disk media
 directly, wrote with ball point pens on the disk labels AFTER putting
 them on the disk, I used cheap no name brand bulk disks of any kind, and
 used a hole punch to make them double sided... and at one point, even
 stapled a peice of paper to a disk... and that staple is the ONLY time I
 can think of that I screwed up a disk... two holes and a long dent will
 do that. So I would have to say, the Apple II disk system was pretty
 freakin' stable and reliable to put up with all my abuse)