HardwareCentral has posted a Iwill DU3160 Dual Ultra160 SCSI Controller review. Here a snippet:
Ultra160 SCSI is a natural progression in the continually evolving and improving SCSI technology. Ultra160 SCSI boosts the throughput of the Ultra2 Wide SCSI standard (80 MB/s) by sending two data bits per clock cycle instead of one, resulting in a maximum data transfer rate of 160 MB/s. This double-transition clocking allows both the data and clock lines to run at 40 MHz. Double transition clocking is only one of the many added features of Ultra160 SCSI that make it such an improvement over current designs.Read more
High-end computer systems need increased data transfer capacity for their storage subsystems to keep up with the rapidly increasing data transfer rates harddisks are delivering. Due to higher track and platter densities and faster spindle speeds, we now see an annual 35% growth in the maximum harddisk throughput. To prevent the actual databus (SCSI in this case, but the same applies to UDMA/IDE) from being saturated, and to avoid limiting the number of drives that can be connected to the bus, the bus data transfer capacity needs to grow at a similar rate.
