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SCSI stands for "Small Computer System Interface", and is a standard interface for transferring data between devices on a computer bus. SCSI is pronounced "scuzzy" when spoken aloud, while occasional attempts to promulgate the more flattering pronunciation "sexy" have never succeeded.To attach a computer to the host bus requires a SCSI host adapter which controls the data transfer on the SCSI bus; the peripheral side must feature a SCSI controller (the SCSI controller is generally embedded—integral to the peripheral—in all but the earliest SCSI devices).
SCSI is most commonly used for hard disks and tape storage devices, but also connects a wide range of other devices, including scanners, CD-ROM drives, CD writers, and DVD drives. In fact, the entire SCSI standard promotes device independence, which means that theoretically anything can be made SCSI (SCSI printers actually exist).
In the past, SCSI was very popular on all kinds of computers. SCSI remains popular on high-performance workstations, servers, and high-end peripherals. Desktop computers and notebooks more typically use the slower ATAAdvanced Technology Attachment ATA , is a standard interface for connecting storage devices such as hard disk drives and CD-ROM drives inside personal computers. Many terms and synonyms for ATA exist, including abbreviations such as IDE ATAPI and UDMA ./ IDE interfaces for hard disks and USBNote: USB may also mean upper sideband in radio. Universal Serial Bus USB provides a serial bus standard for connecting devices, usually to a computer, but it also is in use on other devices such as set-top boxes, game consoles and PDAs. Overview A USB sy (USB uses the SCSI command set for some operations) for other devices, since these interfaces, although less general-purpose, cost less to implement.
1 History
Shugart TechnologyShugart Technology is the original name of disk drive manufacturer Seagate Technology. Shugart was forced to change its name because of pressure from Xerox, which owned Shugart Associates ( Alan Shugart's previous venture, which had become a large manufac (the company formed by Alan Shugart after leaving Shugart AssociatesShugart Associates was a computer peripheral manufacturer, famous for introducing the floppy disk to the microcomputer market. They were later purchased by Xerox and the brand name was discontinued in the mid-1980s. Alan Shugart was an IBM manager destine) introduced a simpler interface called SASI (Shugart Associates System Interface) in 1979. At the same time, NCR Corporation's Peripherals division (now Engenio), had developed a more sophisticated product called BYSE, and was developing an ASIC to implement it. In late 1981, NCR and Shugart agreed to merge the best features of the two solutions, and to jointly promote the concept as an ANSI standard. After several committe meetings and after a number of other companies decided to adopt the combined standard, it received the new name "SCSI." In 1986, with SCSI already in widespread use, ANSI approved the SCSI spec (as X3.131-1986). Since then, SCSI has developed as an industry-wide standard, capable of being applied to virtually any computer system (there were even SCSI implementations for the venerable Commodore 64 home computer). The first working SCSI ASIC was donated by NCR to the Smithsonian Museum.
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