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The SCSI (Small Computer
System Interface) pronounced scuzzy. The important
issue to remember about SCSI is that like the serial port,
it has gone through several changes in its long life.
Each device needs a specific ID
number. The older standard follows the numbering scheme
0-7, while the newer standard is 0-15.
SCSI ID 0 = Boot, 7 = Controller
A bootable hard drive should have the device number set to 0 (zero), and the SCSI controller should be set to 7 (seven).
As previously mentioned, SCSI
has lived a long life. This translates to devices of different performance
levels. Mixing devices of different capabilities results in the lowest
performance level of all devices on the chain being used. When dealing
with SCSI devices, you will probably see one or more of the following
connectors. (On servers, you might also see an 80-pin SCSI connector
called an SCA connector).
Figure 62: DB Connectors
The popular connectors are 25, 50, 68 pins.
Notice that SCSI connectors can look much like the serial DB-25 connector.
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