40-Wire Cables
The Master device, which is usually a CD-ROM or CD-ROM recorder / burner, still goes on the END, in the older 40-wire ATA cables. However, we need to set the jumpers as Slave. The Master for this 40-wire cable goes on the Middle connector. Problems may be faced only on older computers (the AT type) for which you should read the manual that came with the motherboard or contact the maker of the system.
You might try it as a Master and there is a possibility that it may work but that's not the way it is to be done. Incase you want to use the cable select with the older drive on a 40-wire cable you should first consult the maker of the drive for the instructions (the instructions will be specific to the vendor).
