Most Mother Boards have two IDE channels, a primary and a secondary, so you can install two IDE cables, each of which has two IDE connectors. That allows up to four IDE devices. In order to have both IDE devices on the same cable, one must be set as the Master device, and one must be set as the Slave. There are usually jumpers on the drive that are labeled M S and CS with CS standing for Cable Select. I have never used the CS setting. If you are connecting both Drives to a single IDE cable, you will need to leave your smaller drive set as the primary master (which it most like is), and set your newer larger drive as the primary slave. If you are using a second IDE cable, you should configure the Large drive on that cable as the Secondary Master.

Hope that's clear
Walt