There's some wiggle room in the floppy so when you move your finger around the hole like that it's pushing the disk to the edges of the casing. So to help see w

There's some wiggle room in the floppy so when you move your finger around the hole like that it's pushing the disk to the edges of the casing. So to help see what's happening here, imagine the casing is 10x10in, the disk is 5x5in, and the hole in the casing is 3in circle. If you're moving your finger clockwise starting by pushing your finger up, the center of the disk is centered with the casing. Move your finger to the right and the disk rolls on the top edge for a bit (spinning counter-clockwise) before you start coming around the inner circle and the disk comes off the top edge and to the side edge. As you are moving your finger clockwise, the disk is pressing against the edges causing it to roll counter-clockwise.