[ The PC Guide | Troubleshooting and Repair Guide | The
Troubleshooting Expert | Troubleshooting Specific Components
| Troubleshooting Floppy Disk Drives | Booting
or Operation Problems ]
There is an apparent failure of the floppy disk controller
Explanation: There may be a failure of some sort with the floppy disk controller. On modern systems the
floppy disk controller is built into the motherboard; on an older system it is typically
found as an expansion card. It is easy to tell which type you have by looking to see what
the floppy cable is connected to.
Diagnosis: Floppy controller failures are relatively rare, although they can
happen. Sometimes an integrated controller on the motherboard can have a problem,
occasionally as a result of a problem with something else on the motherboard. Controller
problems can be caused by resource conflicts or misconfiguration.
- Check the BIOS settings that control integrated resources on newer motherboards, and make sure the floppy controller is
- If your PC uses a separate floppy controller card, check all the connections to it. Try
removing it from its slot and reinserting it; sometimes the card may not be seated
properly and this will fix it. If possible, try switching the controller with another one
and see if that fixes the problem.
- Check for resource conflicts with the
controller on a built-in PC. It usually uses IRQ 6 and DMA channel 2. Most other devices
stay far away from these resources since they are a pretty universal standard, but watch
out for devices like tape accelerator cards. Sometimes they use the same resources since
they work on the floppy interface themselves.
- If you haven't already ruled out the floppy drive itself as a possible problem, you should try troubleshooting it here. You may
want to try swapping the floppy drive to isolate the problem to either the drive or the
- If the floppy controller is built into the motherboard, there is a possibility of a
motherboard problem. This of course is especially true if other symptoms, such as flaky
behavior, are being observed. You might want to troubleshoot
Home - Search
- Topics - Up