Pronounced "SKUH-zee," an abbreviation for Small Computer System Interface, a communications standard and specification for attaching peripherals to desktop computers. Each device (which also may include the internal hard drive and internal CD-ROM drive, as well as external media such as magnetic media, magnetic optical disc drives, scanners, etc.) is linked in series along a SCSI chain, or bus, and each device is given a SCSI address—on the Macintosh, typically a number from 0 to 6. No two devices may have the same SCSI address. Typically, the only devices not included on the SCSI chain are printers and modems. The SCSI standard allows for rapid transfer of data from device to device, or from device to computer. An updated version of the SCSI standard—SCISI2—has a greater bus width, allowing greater throughput.

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