Computer Hardware
To install a second IDE drive into a computer, you must

Set the master-slave jumper to slave on the second drive
Verify that you attach the drive to the connector at the end of the ribbon cable
Use the IDE configuration software to set the new drive as slave
Verify that you define the new drive as D: in the CMOS setup

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

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