These use drastically different types of cabling, because the environment inside the PC is very different from that outside it. Both internal and external cables come in a variety of styles themselves. This is all discussed in more detail on this page . See here for more . However, not all cables are built to the maximum length.
Cables vary in terms of the number of connectors they include.
Generally speaking, longer cables have more connectors, allowing more devices to be attached to the same SCSI bus segment. If the cable has many connectors you may have to leave some of the connectors unused for maximum performance. In all cases, it is recommended that devices be evenly spaced across the cable. Some cables have a built-in terminator at the end of the cable while others require the addition of a separate terminator. See the page on termination for more .