Adaptec 2940UW PRO, User Manual, Page: 11 / 38

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Understanding SCSI
SCSI
(pronounced “scuzzy”) stands for Small Computer Systems
Interface. SCSI is an industry standard computer interface for
connecting SCSI devices (such as a hard disk, CD-ROM drive, or
scanner) to a common SCSI bus.
A SCSI bus is an electrical pathway that consists of a SCSI card
(such as the SCSI Card 2940UW Pro) installed in a computer and one
or more SCSI devices. SCSI cables are used to connect the devices to
the SCSI card.
For the SCSI bus to function properly, SCSI IDs must be assigned to
SCSI devices (SCSI devices and SCSI card), and the SCSI bus must
be properly terminated.
SCSI IDs
Each device attached to the SCSI Card 2940UW Pro, as well as the
SCSI Card 2940UW Pro itself, must be assigned a unique SCSI ID
number from 0 to 15. A SCSI ID uniquely identifies each SCSI device
on the SCSI bus and determines priority when two or more devices
are trying to use the SCSI bus at the same time.