B Compact Disc Overview

The Digital UNIX software is distributed on three read-only compact discs (CD-ROM):

The first CD-ROM is labeled Digital UNIX V4.0B Operating System Volume 1 and contains the operating system software subsets. The software subsets contained on this CD-ROM are documented in Appendix D.
The second CD-ROM is labeled Digital UNIX V4.0B Associated Products Volume 1 and contains the additional software that is shipped with the operating system software. The software subsets contained on this CD-ROM are documented in Appendix E.
The third CD-ROM is labeled Digital UNIX V4.0B Documentation Volume 1 and contains the Digital UNIX documentation set in HTML format for viewing with the Netscape Navigator World Wide Web browsing program. Section 6.6 describes how to invoke Netscape.

This appendix describes how to perform the following tasks:

Load a CD-ROM in a caddy
Insert and remove a CD-ROM
Mount and unmount a CD-ROM

Before you insert a CD-ROM in its drive, make sure you know how to operate the disc drive. The Optical Disc Drive Owner's Manual contains instructions for using the disc drive.

B.1 Loading a CD-ROM in a Caddy

A Digital UNIX CD-ROM must be placed in a caddy before it can be inserted in an RRD42 or RRD44 disc drive. Caddies are not required for RRD43 or RRD45 disc drives. Follow these steps to load a CD-ROM in a caddy:

If a protective cellophane wrapper is on the caddy, remove the wrapper before using the caddy.
Press the tabs on both sides of the caddy and lift the lid.
Remove the CD-ROM from its packaging. Hold the CD-ROM by its edge.
Place the CD-ROM in the caddy, making sure that the labeled side faces up.
Close the lid of the caddy by pressing both corners down firmly.

Figure B-1 shows how to press the tabs of the caddy and lift the lid:

Figure B-1: Pressing Tabs and Lifting Lid of a CD-ROM Caddy

Figure B-2 shows how to place the disc in the caddy:

Figure B-2: Placing a Disc in a CD-ROM Caddy

B.2 Inserting and Removing a CD-ROM

After placing the CD-ROM in a caddy, follow these steps to insert the disc caddy in to a disc drive:

Insert the caddy in to the slot in the disc drive. The disc label should be facing up.
Push the caddy in until it stops.

Figure B-3 shows a CD-ROM (in its caddy) being inserted in to a disc drive:

Figure B-3: Inserting a CD-ROM in to a Disc Drive

B.3 Mounting a CD-ROM

Before you can access the files and directories on a CD-ROM, it must be mounted on a mount point. Follow these steps to mount a CD-ROM:

Log in as root or become superuser.
If you do not know the CD-ROM device name, use the file command specifying the raw device to find it. CD-ROM devices are prefixed with the letters RRD. Using the | (pipe) command to filter the output of the file command to the grep command to search for RRD ensures that only your CD-ROM devices are output in the result of the command. Enter a command similar to the following:
```
# file /dev/rrz*c | grep RRD
/dev/rrz4c: character special (8/4098) SCSI #0 RRD44 disk #32 \
(SCSI ID #4)
```
In the previous example, the CD-ROM device is RRD44 on device /dev/rz4c. The backslash in the previous example indicates line continuation and is not in the actual display. If you have more than one RRD device connected to your system, specify the device where the CD-ROM will be mounted.
Standard device names begin with rz for the block special file and rrz for the raw (character) special file. The result of the file command displays the raw device name, but you must specify the block special file when mounting the CD-ROM device.
Make a directory that will be the mount point for the CD-ROM, using the mkdir command. Then mount the CD-ROM using the mount command with the following syntax, substituting the unit number of your CD-ROM drive for the unit_number.
mount -r /dev/rzunit_numberc /mount-point
For example, to mount the CD-ROM in drive /dev/rz4c on the directory /cdrom, enter the following commands:
```
# mkdir /cdrom

# mount -r /dev/rz4c /cdrom
```
To ensure that the CD-ROM is remounted in the event that your system crashes or is rebooted, you can use the text editor of your choice and open the /etc/fstab file. Add a line similar to the following:
```
/dev/rz4c       /cdrom   ufs   ro   0  0
```
When you have ensured that your edits are correct, write and quit the file. The system will now mount the CD-ROM on the /cdrom mount point on every reboot.

B.4 Unmounting a CD-ROM

You must unmount a CD-ROM by using the umount command before you can eject it from the disc drive. To unmount a CD-ROM, you must be superuser or root and you must be one directory above the mount point of the CD-ROM. Use a command similar to the following to unmount a CD-ROM:

# umount /dev/rz4c

If you do not unmount the CD-ROM before trying to remove it, the CD-ROM will not eject from the drive when you press the EJECT button. If you are not one directory above the mount point of the CD-ROM when you execute the umount command, you will see the message device busy.

To remove the disc from the disc drive after it is unmounted, press the EJECT button on the disc drive.

If the EJECT button is disabled by software or if the drive does not eject the caddy after you press the EJECT button, refer to your Optical Disc Drive Owner's Manual for instructions.