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What is SCSI?

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

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

SCSI is generally considered a higher-end alternative to ATA. A single ATA 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 ATA.

SCSI Standards

SCSI StandardCable LengthSpeed (MBps)Devices Supported
SCSI-1658
SCSI-265-108 or 16
Fast SCSI-2310-208
Wide SCSI-232016
Fast Wide SCSI-232016
Ultra SCSI-3,8-bit1.5208
Ultra SCSI-3,16-bit1.54016
Ultra-2 SCSI12408
Wide Ultra-2 SCSI128016
Ultra-3 (Ultra160/m) SCSI1216016

Wide and Narrow SCSI

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



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