Seagate Barracuda 18LP ST318275LC, Product Manual

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Barracuda 18LP Product Manual, Rev. E 57
Recommended mating 80-position PCBA mount connectors:
Right-angle to PCBA connectors
Seagate P/N: 77678559 Amp US P/N: 2-557101-1 Amp Japan P/N: 5-175474-9
For additional information call Amp. FAX service at 1-800-522-6752.
[1] Closed end type 68 pin connector used. Terminator required.
[2] Open end type (in-line application) connector used. No terminator.
[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. For “LW” models, priority is ID7 to ID0, then ID15 to ID8 (ID 8
very lowest).
[6] Last drive on the daisy chain.
Figure 10. SCSI daisy chain interface cabling for “LW” model drives
Straight-in connector Hot plug version (with ground guide-pin)
Seagate P/N: 77678703
Amp US P/N:
or 2-557103-1
94-0680-02-1 787311-1 with polarization
Amp US P/N:
or 2-557103-2
94-0680-02-2 787311-2 without polarization
Amp Japan P/N: 5-175475-9
Host Adapter
PCBA
Pin 1
(check your
adapter for Pin 1 location)
[6]
SCSI ID 1
SCSI ID 0
SCSI ID 7 [5]
2 through X
SCSI devices [4]
[1]
[1]
[3]
[2]
Terminator
“LW” Model
Drive
Note. Do not mix drives operating
single-ended with drives
operating differential on the
daisy chain.
[2]