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The Power Mac G4 has an Ultra DMA/66 (ATA-5) interface and an ATA-3 interface for internal mass storage and removable media devices. The enclosure includes data and power connectors for the boot drive and a second internal drive on the Ultra DMA/66 interface. It also has a power connector for a third internal drive. The enclosure has data and power connectors for the internal ATAPI DVD-ROM or DVD-RAM drive and an internal ATAPI Zip drive. Those drives are connected to the ATA-3 interface.
The enclosure includes three drive bays for mass storage devices. One bay is occupied by the boot drive. A drive in one of the other bays can be connected to the second drive connector on the Ultra DMA/66 cable assembly or to an optional or user installed third-party PCI controller card. None of the drive bays can be modified to support removable drive bay kits.
The Ultra DMA/66 bus supports PIO Mode 4, DMA Mode 2, and Ultra DMA Mode 2 data transfers. The ATA-3 bus supports PIO Mode 4 and DMA Mode 2 data transfers.
The ATA-3 channel supports two ATA devices. The devices are configured in a ATA Device 0/1 configuration. The ATAPI DVD-ROM and Zip drive, when installed, occupy both device locations on the ATA-3 channel. The ATAPI DVD-ROM 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 ATA-3 bus in the Zip drive bay. The device must be device-select jumpered as Device 1 (slave).