Installing the Combination CD/DVD Drive

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The combination CD/DVD reader can be installed as a replacement for, or together with, the CD-ROM reader that came with the workstation. (I left the CD-ROM readers in my machines, primarily because it was so difficult to remove the power plug from them!)

All enhanced integrated drive electronics (EIDE) devices should be configured for the Cable Select jumper position, which assigns "master" and "slave" status to devices by their position on the interface cable. When two EIDE devices are connected to a single EIDE interface cable and are configured for the Cable Select jumper position, the device attached to the last connector on the interface cable is the "master" or boot device (drive 0), and the device attached to the middle connector on the interface cable is the "slave" device (drive 1).

With the two EIDE interface connectors on the system board, your system can support up to four EIDE devices. EIDE hard-disk drives should be connected to the EIDE interface connector labeled "IDE1." EIDE tape drives and CD-ROM drives should be connected to the EIDE interface connector labeled "IDE2."

1. Physically Installing The Drive

A. Locate the mode select jumper (a 6-pin, straight angle header on the back of the drive). The drive comes from the factory configured to be the "master" EIDE device (see figure below).

Since the Dell workstation uses cable position to determine whether an EIDE device is "master" or "slave" move the jumper from the MA ("master") to the CS (Cable Select) position (see figure below).

B. Turn off your computer and peripherals, and make sure that you unplug the computer from its electrical outlet before you remove the computer cover.

C. If you have installed a padlock through the padlock ring on the back panel (item #2 in figure below), remove the padlock and slide the padlock ring to the open position.

D. Facing the left side cover, press the release button (located at the bottom-left corner of the front bezel -- item #1 in figure below) and lift the bottom of the cover, allowing it to pivot up toward you.

E. Disengage the hooks that secure the cover to the top of the chassis, and lift the cover away. Now remove the front bezel by pressing the tab release (#1) marked with the arrow in the figure below. While pressing the tab release, tilt the bezel away from the chassis, disengage the two retaining hooks at the bottom of the bezel (#2 on the figure), and carefully pull the bezel away from the chassis.

F. Remove the drive bracket from the bay you want to use. Squeeze the metal tabs that extend from each side of the drive bracket toward each other, and pull the bracket out of the bay (see figure below).

If you decide to replace the CD-ROM drive with the combination CD/DVD drive, disconnect the DC power cable and interface cable from the back of the CD-ROM drive before sliding the bracket out of the bay. (I huffed and I puffed, but I couldn't get the DC power cable to release from the CD-ROM drive, so I elected to place the combination CD/DVD drive in the slot below the CD-ROM drive!) To remove the old drive from the bracket, turn the drive/bracket assembly upside down and unscrew the four screws that secure the drive to the bracket (see figure below).

G. Attach the drive bracket to the new drive. Turn the drive upside down, and locate the four screw holes around its perimeter. Fit the bracket over the drive, and then tilt the front of the drive up so that the bracket drops down into place. To ensure proper installation, all screw holes should be aligned and the tabs on the front of the bracket (#1 on the figure above) should be flush with the front of the drive. To further ensure proper positioning of the drive in the chassis, insert and tighten all four screws in the order in which the holes are numbered (the holes are marked "1" through "4").

H. Slide the new drive into the drive bay until the drive snaps securely into place. Make sure that both bracket tabs snap into place in the drive bay. Connect a DC power cable to the power input connector on the back of the drive. Connect the EIDE interface cable to the interface connector on the back of the drive.

I. If you already have installed the second hard drive, you should replace the front bezel and computer cover following the steps below.

To replace the bezel, fit the two retaining hooks on the bezel into their corresponding slots at the bottom of the chassis (see figure above). Then rotate the top of the bezel toward the chassis until the top tabs snap into their corresponding slots on the bezel.

To replace the computer cover, perform the following steps:

  1. Check all cable connections, especially those that might have come loose during your work. Fold cables out of the way so that they do not catch on the computer cover. Make sure cables are not routed over the drive cage since they will prevent the cover from closing properly.
  2. Check to see that no tools or extra parts (including screws) are left inside the computer's chassis.
  3. Facing the left side of the computer, hold the cover at a slight angle as shown in the figure above and then align the top of the cover with the top of the chassis.
  4. Insert the three hooks on the cover into the three recessed slots on the computer chassis so that the tabs catch the hooks inside the slots.
  5. Pivot the cover down toward the bottom of the chassis and into position. Make sure the securing hooks at the bottom of the cover click into place.

2. Configuring The Workstation to Use the Combination CD/DVD Drive.

When you boot the machine the Kudzu program will activate and ask whether you wish to configure the drive. Select "Configure" on the Kudzu menu and the boot-up will continue.

A. Modifying the /etc/fstab file. Log in as user "root" and confirm the device name for the new drive. At the shell prompt type:

> dmesg | grep "hd" <ENTER>
The response should include the lines:
hdd: ATAPI 48X DVD-ROM drive, 512kB Cache
which confirms that the device driver for the new combination CD/DVD drive is "/dev/hdc." NOTE: If you kept the CDROM drive in the machine then the device driver for the new combination CD/DVD drive will be "/dev/hdd."

It is a good practice to always make a backup copy of a file before changing it!

> cd  /etc/ <ENTER>
> cp  fstab  fstab.bak <ENTER>

Edit the /etc/fstab file and add the following line:

/dev/hdc   /mnt/dvdrom/    auto   defaults  0  0
This will mount the new drive (dev/hdc) at /mnt/dvdrom. Next, create the mount point by typing at the command prompt:
> mkdir /mnt/dvdrom <ENTER>
> chmod 775 /mnt/dvdrom <ENTER>
NOTE: RedHat 7.0 will not properly recognize the large files on DVD-ROMs, so you will not be able to read complete DVDs correctly at this time. (The current verison of the WES software works only with RedHat 7.0.) The upgrade to RedHat 7.2 after the next version of the Weather Event Simulator software is released later this year will eliminate this limitation.)

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created by Bernard N. Meisner
Latest revision: 7 October 2002