Dell OptiPlex Gs Reference and Installation Guide (.pdf) - Page 91
General Procedure for Installing SCSI Devices, Internal SCSI Cable
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cable goes to SCSI host adapter card SCSI device in 5.25-inch drive bay SCSI device in hard-disk drive bracket Figure 7-15. Internal SCSI Cable • If you have an external SCSI device, you have a shielded external cable that connects to the external SCSI connector on the SCSI host adapter card. You have a separate power cable to connect the SCSI device to power. Before installing SCSI devices in your computer, you must configure the termination on your SCSI device(s) to conform to the guidelines that follow. NOTE: The SCSI host adapter card is shipped with termination enabled. • If only one SCSI device is installed internally, con- nect the device as follows: - Attach the end connector on the internal SCSI cable to the SCSI device, and leave the termination enabled on the SCSI device. - Attach the other end connector on the internal SCSI cable to the SCSI host adapter card, and leave the termination enabled on the adapter card. • If two SCSI devices are installed internally, connect the devices as follows: - Attach one of the devices to one of the end connectors on the SCSI cable, and leave the termination enabled on that device. - Attach the other end of the SCSI cable connector to the SCSI host adapter card, and leave the termination enabled on the adapter card. - Disable the termination for the other device you attach to the cable. • If both internal and external SCSI devices are attached to the SCSI host adapter card, connect the devices as follows: - Attach an end connector on the internal SCSI cable to the internal device, and leave the termination enabled on the device. - Attach the other end connector on the internal SCSI cable to the SCSI host adapter card, and disable the termination on the adapter card. - Attach the external SCSI cable to the external connector on the SCSI host adapter card, and leave the termination enabled on the external device. CAUTION: Dell does not recommend connecting both internal and external devices to a single channel on a SCSI host adapter card. Such a configuration is likely to cause read and write failures. General Procedure for Installing SCSI Devices Configure and install one or more SCSI devices in your computer as follows: 1. Determine which connector on the internal SCSI cable you will attach to each SCSI device. See "SCSI Configuration Guidelines" found earlier in this section. 2. Unpack each SCSI device and prepare it for installation. Ground yourself by touching an unpainted metal surface on the back of the computer. Configure the device for a SCSI ID number, and disable the termination, if necessary. For instructions, see the documentation that came with the SCSI device as well as "SCSI Configuration Guidelines" found earlier in this section. Installing Drives 7-11