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

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

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Computer Hardware
What is the most likely cause of an "FDD controller Failure" error message?

None of these
you forgot to flash CMOS
you installed the floppy disk drive cable backward
you did not set the jumper on the floppy drive to drive A
your computer's floppy drive is defective

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