I wanted to check some 5.25" floppies. I found a 5.25"Apple drive model #A9M0107. I plugged it into the back of my Classic II running O.S. 7.0. The floppy drive kept cycling and I kept getting a small screen with this" floppy is unreadable". The drive is open with no floppy in it. I tried a few times but no difference. I am thinking the floppy drive is faulty. I have never used an external 5.25 drive before. Are there any tips for checking or setting the drive? It seems to think it always has an unreadable disk in it, opened or closed. The open and close lever works fine. Anyone familiar with this type of drive?