SCSI Cable
SCSI devices that have their own enclosures and power supplies (rather than residing inside the PC) can be connected using external cables. Internal cables are used to connect SCSI devices that are installed within the PC.
External and internal cables have very different constructions; the cables for external use need to be able to counter the risk of data corruption that such an environment creates. External cables are therefore designed to protect the data which travels along them. Internal cables do not have to have this kind of protection because the PC metal case performs the function of protecting inside components from external interference, such as electromagnetic and radio frequency noise. As a result, internal cables are easier to produce and therefore cheaper to produce and buy.
There are many types of cables that can be used with SCSI. This makes the technology a little confusing to some at first, but it is a testament to the great flexibility of the SCSI interface and its ability to offer more choice and more options.
Because there are such a large amount of SCSI cables available, there is also a wide range of devices which can be connected to the computer externally or internally, vie SCSI. Most often used for connecting tape storage devices or hard disks, SCSI can also be used for printers, scanners, CD ROM drives, DVD drives and more. Because the SCSI standard promotes device independence, it can be used with almost any computer device.
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