Computer Model?
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.