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Seagate Medalist Pro 2160N User Manual Page 57

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NPS-3004002-01
document version 4/23/97
SCSI ID and Termination Settings
Power Computing Corporation - Confidential
Page of 13
SCSI ID and Termination Settings
for Systems with terminated CD-ROM drives
Calculating a SCSI ID
First set of pins has a value of 1
Second set of pins has a value of 2
Third set of pins has a value of 4
The SCSI ID of a drive is calculated
by adding the corresponding values of
the pin sets with jumpers.
Examples:
ID = 0
Note:
Pin set 1 is commonly refered to as A0, ID 0, or E1.
Pin set 2 is commonly refered to as A1, ID 1, or E2.
Pin set 3 is commonly refered to as A2, ID 2, or E3.
Conventional Device Placement
One end of the SCSI cable is connected to the
motherboard. The last connector at the opposite
end of the cable must
always be connected to
the terminated SCSI device.
If there are two hard drives specified in a unit's
configuration, the higher capacity drive should
be set to ID 0, the other drive should be set to
ID 1. Since the CD-ROM is terminated, neither
hard drive should be terminated.
A0
A1
A2
A0
A1
A2
A0
A1
A2
ID = 1
A0
A1
A2
ID = 2
A0
A1
A2
ID = 3
A0
A1
A2
ID = 4
A0
A1
A2
ID = 5
A0
A1
A2
ID = 6
Conventional Power Computing ID
Settings
Device• • SCSI ID
Main hard drive• • 0
Second hard drive• • 1
JAZ drive• • • 2
CD-ROM drive• • • 3
(reserved for TStation MLB)• 4
Zip Drive • • • 5
(reserved for MiddleDriveª • 6
Main Logic Board• • 7
Notes on RAID Systems
RAID systems have two SCSI buses; one is the
standard motherboard bus and the other is
provided by the RAID SCSI controller card. The
RAID drives are always connected to the RAID
SCSI bus while any other devices such as the
CD/ROM, Jaz, Zip or additional hard drives are
connected to the internal SCSI bus.
For the internal SCSI bus devices, the rules
above for conventional drive placement still
apply. For the RAID SCSI bus, drive 0 should
always be terminated and drive 1 should not be
terminated.
* NOTE: On following pages, the Default setting
listed is the way the drive comes out of the box
from the drive vendor.
2
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