I've connected my product with the SCSI 68 pin connector. The specifications state that the connector is SCSI-3, which has a data transfer rate of 20 MB per second. Why isn't the data transfer speed faster?

• The SCSI 68 pin connector on this scanner is a Fast/Wide SCSI interface that is compliant with the ANSI SCSI-2 specifications. Therefore, the maximum data transfer rate is 20 MB per second.