I had the same problem on my Teac FD-55GFR 5 1/4" Drive, as I was trying to recover some old applications of mine. Here are some advices: 1. Check if the BIOS setting is correct (1.2MB/5 1/4") 2. Check if the jumper configuration is correct - you can find that at: http://www.teac.com/DSPD/pdf/5fd0050a.pdf 3. My problem: the spring that holds the head #1 on the disk surface probably "got old". If this is the problem, try to press it gently onto the disk, and push it twards the tracks at the end of the disk (the center). If this was useful, I would appreciate a thank you mail... just kidding ;).