Computer Hardware
Whenever you have a hardware resource conflict, it will more likely be an IRQ conflict rather than an i/o conflict because:

software tends to mess up IRQs
I/O addresses cannot conflict
the BIOS sometimes has more of a problem controlling IRQs
software tends to correct I/O conflicts
there are a lot more I/O addresses than IRQs.

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Computer Hardware
After displaying the directory of a floppy disk, a different floppy is inserted into the drive. The contents of the original floppy continue to display regardless of the director requests on the other floppies placed in the drive. You remove the drive in question and install it into your test system, and it does not exhibit the problem. You should next replace the:

Floppy drive ribbon cable
None of these
System's power supply
System's floppy drive device driver
Original IDE controller

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