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With so many different types of SCSI protocols, cables and connection methods, it's no surprise that there also exists on the market an enormous number of different SCSI adapters. These devices are generally manufactured and sold by the same people who make and sell SCSI cables, and are intended to solve some of the problems that crop up when SCSI users try to interconnect different kinds of SCSI hardware.
There are probably over a hundred different types of SCSI adapters available; some of the most popular ones fall into these general categories:
It's important to remember that there can be reliability issues with using adapters. It might be possible to mate two devices to each other with the use of a mechanical adapter, but that doesn't mean that the interface will necessarily function reliably with that configuration. To some extent it depends on the nature of the SCSI bus being implemented, and the quality of the hardware. In some cases adapters work just fine with no problems, but in others getting everything to work together can be a bit tricky. It's best to consult with a qualified hardware vendor if you are unsure of how to make different devices work together.
Another aspect to keep in mind is that the cost of some SCSI adapters can be very high. It might be possible to adapt one type of device to use it with a very different type of host adapter, but in many cases it will not be cost-effective. Some adapters are so expensive that it would be cheaper to get a new cable, host adapter or other "incompatible" hardware rather than buy the adapter. This is particularly true of adapters that change between signaling methods.
Next: SCSI Bus Termination