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Ultra DMA/33 Hard Disk Drive

The logic board supports an internal hard disk drive that uses the Ultra DMA/33 (ATA/ATAPI-4) interface. The Power Macintosh G3 comes with an Ultra DMA/33 hard disk or an Ultra2 SCSI hard disk installed in Slot 3.

The internal hard disk drive has a 40-pin connector and a separate 4-pin power connector. An 80-conductor high-density cable with a 40-pin connector is attached to the main logic board. To provide improved signal quality, the 80-conductor cable provides a separate ground for each of the signals on the 40 pin connector. The separate power cable is attached directly to the power supply.