3. Align the tabs on side of the peripheral bay with the locking slots in the chassis and slide the peripheral bay forward.
4. Tighten the thumbscrew securing the peripheral bay to the chassis (see Figure7-1).
5. Replace the front fan assembly (see "Replacing the Front Fan Assembly" in "Installing System Board Options").
6. Replace the system cover.
7. Close the front bezel.
Interface Cables
If you install a SCSI device, you will connect it to the secondary SCSI interface connector (SCSI2 [Channel B]) on the system board (see Figure6-1), or to a SCSI
host adapter on an expansion card.
These interface connectors are keyed for correct insertion. Keying ensures that the pin-1 wire in the cable goes to the pin-1 ends of the connectors on both ends.
When you disconnect an interface cable, take care to grasp the cable connector, rather than the cable itself, to avoid stress on the cable.
SCSI Configuration Information
Although SCSI devices are installed essentially the same way as other devices, their configuration requirements are different. To configure a SCSI device installed in the
peripheral bay, follow the guidelines in the following subsections.

SCSI ID Numbers

Each device attached to a SCSI host adapter must have a unique SCSI ID number from 1 to 7.
When SCSI devices are shipped from Dell, the default SCSI ID numbers are assigned as follows:
lA SCSI tape drive is configured as SCSI ID 6 (the default ID number for a tape drive).

Device Termination

SCSI logic requires that the two devices at opposite ends of the SCSI chain be terminated and that all devices in between be unterminated. The SCSI cable included in
the upgrade kit has an active terminator installed at the end of the cable. Therefore, when configuring the devices in the peripheral bay, you should disable the devices
termination.
Installing a Device That Uses the System's Integrated SCSI Controller
1. Turn off the power to the system, including any attached peripherals, and disconnect the system from the electrical outlet.
2. Prepare the drive for installation.
Ground yourself by touching an unpainted metal surface on the back of the system, unpack the drive, and compare the jumper and switch settings with those in
the drive documentation. (See "SCSI Configuration Information," for information on setting the drive's SCSI ID number and enabling termination [if required].)
Change any settings necessary for this system's configuration.
3. Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
4. Remove the system cover.
5. Disconnect the cable connected to the interposer board on top of the peripheral bay.
This cable is the system board interface cable connecting the interposer board of the CD-ROM/diskette drive to the system board.
6. Remove the inserts from the front of the peripheral bay.
NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that devices be attached to the cable in order by ID number.
WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see
"Safety First— For You and Your System" in "Troubleshooting Your System."
CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document.