SCSI Cable
External cables are used to connect SCSI devices that do not reside inside the PC, but rather have their own enclosures and power supplies; internal cables connect SCSI devices installed within the PC system. These cables are totally different in construction, primarily because the external environment represents much more of a risk to data corruption. This means external cables must be designed to protect the data travelling on the cable. Internal cables don't have this problem because the metal case of the PC shields the components inside from most of the electromagnetic and radio frequency noise and interference from the "outside world". Thus, internal cables can be made more simply and cheaply than external ones.
There are many different aspects about SCSI that can be confusing to someone new to the technology and even someone not new to it. Of all of the aspects of SCSI that sometimes cause a bit of difficulty, cables and connector issues are probably the worst. Unlike the IDE/ATA world, where there are a handful of different cable types, with SCSI there are literally dozens of different types of cables. This is a result of the flexibility of the SCSI interface more choice means more options, and hence, more decisions.
This large amount of cables means a large array of devices can be interconnected to the computer via SCSI either internally or externally. SCSI is most commonly used for hard disks and tape storage devices, but also connects a wide range of other devices, including scanners, printers, CD-ROM drives, CD recorders, and DVD drives. In fact, the entire SCSI standard promotes device independence, which means that theoretically SCSI can be used with any type of computer hardware.
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