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The type of cabling you receive with your SCSI device depends on the type of device you are installing.

‡If you are installing an internal narrow SCSI device (such as a CD-ROM drive or tape drive), you have a 50-pin internal SCSI cable as shown in Figure 7-14. One end of this cable attaches to the SCSI host adapter. The three connectors on the other end of the cable are used for attaching up to three narrow SCSI devices installed in the externally accessible drive bays.

50-pin SCSI cable (to devices in externally accessible drive bay)

68-pin SCSI cable (to hard-disk drives)

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‡If you are installing an internal wide SCSI device (such as a wide SCSI hard-disk drive), you have a 68-pin internal SCSI cable as shown in Figure 7-14. One end of this cable attaches to the SCSI host adapter and the two connectors on the other end of the cable are used for attaching up to two SCSI hard-disk drives installed in the hard-disk drive bracket.

‡If you are installing 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 an AC power source.

Before installing SCSI devices in your computer, you may need to configure the termi- nation on your SCSI device(s). Both types of internal SCSI cables contain terminators on the device end of the cables, so the devices connected to these cables must have termination disabled. External SCSI cables do not have terminators, so termination must be enabled on the SCSI device itself.

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If you are installing only internal SCSI devices, verify that termination is enabled on the SCSI host adapter and disabled for all other internal SCSI devices. If you are installing both internal and external SCSI devices, verify that termination is enabled on the external SCSI device and disabled for the SCSI host adapter and all internal SCSI devices.

Installing Drives 7-17