IDE stands for Integrated Device, (or Drive), Electronics. EIDE is a later standard of IDE. It stands for Enhanced Integrated Device, (or Drive), Electronics. The picture above shows how to connect an IDE cable to two drives. Using jumpers that are normally located on the back of a drive, the top drive should be made the "master" and the bottom drive should be made the "slave." The master drive is normally located at the end of a two connection IDE cable. Since data can not go to and from each drive at the same time, it is necessary to make one drive the master and the other drive the slave.