Maximum Storage Expansion for PCI Macs The Storage Performance table below illustrates Macintosh port connectivity limitations, data throughput limitations, and the performance gap of available disk drives, when connected to internal or external SCSI ports without using a PCI SCSI controller. Connecting these devices without a SCSI controller will not deliver the anticipated data transfer rates regardless of the performance of the drive you connect. The Price/Performance factor is extremely critical in choosing the right interface and drive.

	Ultra SCSI-3 v. Ultra 2 SCSI drives The differences are determined by data transfer rates, cable length and number of SCSI devices supported. Ultra 2 SCSI offers twice the data Xfer rate (80 MB/s), while Ultra SCSI-3 offers 40 MB/s. Ultra 2 SCSI allows 12 meters of cable length.
	8 bit v. 16 bit drives In simple words, Mac external and internal 50 Pin Ports are 8-bits wide; 8 bit drives allow half the data Xfer rate of 16 bit drives. 16 bit drives are significantly faster.

Integrating Ultra SCSI-3 & Ultra 2 SCSI (LVD) Drives New Ultra SCSI drives offer a tremendous increase in data throughput. Ultra SCSI offers 20 MB/s (8 bit) and 40 MB/s (16 bit). The new Ultra 2 SCSI (LVD) takes I/O performance to the next level, offering an 80 MB/s (16 bit) transfer rate, increases SCSI cable length to 12 meters. Plus, the number of devices that can be connected is 16.

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