SCSI / Small Computer System Interface for Not Yet Techies

"Computer Careers: Helping Computers Communicate With Hardware and Peripheral Equipment"

by Richard Stooker, President Info Ring Press and author of Secrets of Changing to a Computer Career

SCSI stands for Small Computer System Interface is a standard for data storage, access and management on networks. SCSI is a set of ANSI standards for PCs to communicate with peripheral hardware such as disk drives, tape drives, CD-ROM drives, printers and faxes.

For attaching storage to computers, ATA is the most prevalent standard. AT stands for Advanced Technology, and this is for small computers such as PCs. On large computers, SCSI is the most common standard. It uses parallel bus architecture.

It was developed by Apple Computers and still used on MacIntoshes. Most PCs do have ports for it and they're supported by all major operating systems.

A key element of SCSI is the Command Description Block (CDB)

With it you can connect from 7 to 15 devices daisy chain fashion to one port. This makes it a good interface for use with portable and notebook computers. A PC Card can be an interface for a laptop.

One SCSI standard is Ultra-2 (Ultra2) which uses 40 MHz to transfer data at rates up to 80 MBps, sending the signal over two wires with the data represented as the difference in voltage between the two wires.

The current SCSI standard is Ultra-3 (Ultra3).

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