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  • SCSI (Small Computer System Interface)

    SCSI (Small Computer System Interface) is a set of ANSI standards for connecting devices to computer systems. The vast majority of SCSI devices are data storage devices.

    Standard SCSI is a parallel technology, but many serial SCSI variants exist, including FireWire and Fibre Channel.

    SCSI is generally considered a higher-end alternative to IDE (Integrated Drive Electronics). A single IDE controller can control two drives. A single SCI controller can control 8 or 16 drives. In addition, SCSI usually offers greater cable length and higher length than IDE.

    SCSI Standards

    SCSI Standard Cable Length Speed (MBps) Devices Supported
    SCSI-1 6 5 8
    SCSI-2 6 5-10 8 or 16
    Fast SCSI-2 3 10-20 8
    Wide SCSI-2 3 20 16
    Fast Wide SCSI-2 3 20 16
    Ultra SCSI-3,8-bit 1.5 20 8
    Ultra SCSI-3,16-bit 1.5 40 16
    Ultra-2 SCSI 12 40 8
    Wide Ultra-2 SCSI 12 80 16
    Ultra-3 (Ultra160/m) SCSI 12 160 16

    Narrow and Wide SCSI

    Many SCSI standards have options for Narrow or Wide operation. Narrow SCSI is parallel SCSI which transmits 8 bits of data at a time. Wide SCSI is parallel SCI which transmits 16 bits of data at a time.


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