Seagate ST318436LW - Figure 10 B. SCSI Daisy-Chain Interface Cabling for N and W Model Drives

68 Barracuda 18XL Product Manual, Rev. A
[1] Closed-end type 58-pin connector used. Terminators on the PCB enabled.
[2] Open end type (in-line application) connector used. Terminators disabled.
[3] Host need not be on the end of the daisy chain. Another device can be on the end with the terminator, the
host having no terminator.
[4] Total interface cable length must not exceed that specified in ANSI Standard T10/1302D (including host
adapter/initiator). The cable length restriction limits the total number of devices allowed.
[5] SCSI ID7 has highest arbitration priority. ID0 has lowest for “N” models. For “W” models, priority is ID7 to
ID0, then ID15 to ID8 (ID8 is very lowest).
[6] Last drive on the daisy chain.
[7] Open-end type 68-pin connector used. On “W” models, install terminator enable (
TE
) jumper plug. “N” and
“W” drives do not require external terminators.
Figure 10b. SCSI daisy-chain interface cabling for “N” and “W” model drives
Host Adapter
PCB
Pin 1
(check your
adapter for Pin 1 location)
[6]
[6]
[7]
SCSI ID 1
SCSI ID 0
SCSI ID 7 [5]
2 through X
SCSI devices [4]
[1]
[1]
[3]
[2]
“N” Model
Drive
“W” Model
Drive
[2]