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The removable-media drives are connected by way of an EIDE (ATA-3) interface.
The CD-RW or DVD drive and Zip drive, when installed, occupy both device locations on the IDE channel. The devices operate in an IDE Device 0/1 configuration. The CD-RW or DVD drive is Device 0 (master), and the Zip drive is Device 1 (slave). If the Zip drive is not factory installed in the system, a power and data cable is available for adding a Zip drive to the EIDE bus in the Zip drive bay. The device must be device-select jumpered as Device 1 (slave).
The EIDE bus supports PIO Mode 4 and DMA Mode 2 data transfers.