Hi,

So the motor spins ok without a disk in the drive, but only goes 1/2 a turn with a disk.

1st is the actual disk itself tight? If the actual media its to tight in its sleeve then there may not be enough torque in the drive to spin it up. Have you tried another floppy?

Next point would be the timing sensor. This tells the drive that the disk is actually spinning, it sences the hole that is just off the centre of the floppy. If you turn the floppy by hand you will see a hole in the media at some point.

Rich.