Maxtor HD model?
Sounds like you have an SATA hard drive in the new MC computer. The old drive sounds like a Parallel ATA drive. Just jumper the Maxtor drive as a slave and place it in the middle of the same cable that is being used by the CD/DVD drive.
If you have a free IDE slot, you can jumper the drive as a master, connect it to the end of a cable, and connect the other end of the cable to its own IDE slot (channel) on the motherboard.
Connecting the drive as a master and as the only drive on the cable is preferable.
I have a maxtor hd from an old computer (has wide ribbon cable conection) that I would like to put in my hew hp medica center computer that has hd in it that connects with what looks like an oversized phone hook-up connector....how do I hook this up ????????