Acer Altos 9100 Series User Manual page 140

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The wide SCSI hot-swap drive tray includes an 8/12-pin ID cable (see Figure 2).
This cable allows you to define the hard disk ID using the ID switches on the
backplane board.
The narrow SCSI drive tray comes with a 6-pin ID connector but no cable since
narrow SCSI drive specifications vary depending on the brand. The ID setting
feature on the backplane board does not work if you do not connect an ID cable.
Figure B-4 shows the pin definition of ID cable connector J2 on the drive tray to
help you connect the cable properly. Make sure to match pin 1 on the cable with
pin 1 on J2.
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8-Pin Connector for
Wide SCSI ID Cable
6-Pin Connector for
Narrow SCSI ID Cable