LaCie DDS4 Drive, Руководство пользователя

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If you have just one SCSI peripheral connected to your computer, priority is
not an issue. The priority levels are used to guide the arbitration process. In a
nutshell, arbitration is the process by which different devices decide which one
can have control of the bus. If more than one device wants control at the same
time, the higher-priority device will "win," while the lower-priority device will
have to wait for its turn.
If you have several peripherals in your SCSI chain, you will typically want to set
the slower devices (scanners, tape drives) to the higher-priority IDs, to ensure
that they are not crowded off the bus by the faster devices. But, if you have
any devices that absolutely cannot tolerate delays in receiving their stream of
data –such as a CD-RW or a video encoder - they should be given top priority
on the bus. Many people also like to make the host adapter the highest-
priority device on the bus, which is why host adapters often have a default
SCSI ID of 7.
For even more detailed information on the specifics of SCSI, LaCie encourages
you to visit the following Internet sites:
http://www.scsita.org
http:/www.scsifaq.org