I found some interesting stuffs on internet about burning cad on bsd. For 
all you dreamcast user bsd users,u might want to take look at this.

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Introduction
CDs have a number of features that differentiate them from convential disks. 
Initially, they weren't writable by the user. They are designed so they can 
be read continuously without delays to move the head between tracks. They 
are also much easier to transport between system than similar sized media 
was at the time.

CDs do have tracks, but by this they mean a section of data to be read 
continuously, not a physical property of the disk. To produce a CD on 
FreeBSD, you prepare the data files that are going to make up the tracks on 
the CD, then write the tracks to the CD.

The ISO 9660 file system was designed to deal with these differences. It 
unfortunately codifies file system limits that were common then. 
Fortunately, it provides an extension mechanism that allows properly written 
CDs to exceed those limits while still working with systems that do not 
support those extensions.

The mkisofs program is used to produce a data file containing an ISO 9660 
file system. It has options that support various extensions, and is 
described below. You can install it with the /usr/ports/sysutils/mkisofs 
port.

The tool to use to burn the CD depend on whether your CD burner is ATAPI or 
something else. ATAPI CD burners use the burncd program that is part of the 
base system. SCSI and USB CD burners should use the cdrecord from the 
/usr/ports/sysutils/cdrecord port.

mkisofs
mkisofs produces an ISO 9660 file system that is an image of a directory 
tree in the Unix file system name space. The simplest usage is:

    # mkisofs -o imagefile.iso /path/to/tree

This command will create an imagefile containing an ISO 9660 file system 
that is a copy of the tree at /path/to/tree. In the process, it will map the 
file names to names that fit the limitations of the standard ISO 9660 file 
system, and will exclude files that have names uncharacteristic of ISO file 
systems. Read mkisofs(8) for details of this process, and options that can 
be used to control it.

A number of options are available to overcome those restrictions. In 
particular, -R will enable the Rock Ridge extensions common to Unix systems, 
-J causes Joliet extenions used by Microsoft systems, and -hfs can be used 
to create HFS file systems used by Macs. Read mkisofs(8) for more 
information on the last two.

For CD's that are going to be used only on FreeBSD systems, -U can be used 
to disable all filename restrictions. When used with -R, it produced a file 
system image that is identical to the FreeBSD tree you started from, though 
it may violate the ISO 9660 standard in a number of ways.

The last option of general use is -b. This is used to specify the location 
of the boot image in producing a ``El Torito'' bootable CD. This option 
takes an argument, which is the path to a boot image from the top of the 
tree being written to the CD. So, given that /tmp/myboot holds a bootable 
FreeBSD system with the boot image in /tmp/myboot/boot/cdboot, you could 
produce the image of an ISO 9660 file system in /tmp/bootable.iso like so:

    # mkisofs -U -R -b boot/cdboot -o /tmp/bootable.iso /tmp/myboot

Having done that, if you have vn configured in your kernel, you can mount 
the file system by doing:

    # vnconfig -e vn0c /tmp/bootable.iso
    # mount -t cd9660 /dev/vn0c /mnt

At which point you can verify that /mnt and /tmp/myboot are identical.

There are a large number of other options you can use with mkisofs to fine 
tune its behavior. See mkisofs(8) for details.

burncd
If you have an ATAPI CD burner, you can use the burncd command to burn an 
ISO image onto a CD. burncd is part of the base system, installed as 
/usr/sbin/burncd. Usage is very simple, as it does not have a lot of 
options:

    # burncd -f cddevice data imagefile.iso fixate

Will burn a copy of imagefile.iso on cddevice. The default device is 
/dev/acd0. See burncd(8) for options like setting the write speed, ejecting 
the floppy, and writing audio data.

cdrecord
If you do not have an ATAPI CD burner, you will have to use cdrecord to burn 
your CDs. cdrecord is not part of the base system; you must install it from 
either the port at /usr/ports/sysutils/cdrecord or the appropriate package. 
Changes to the base system can cause binary versions of this program to 
fail, possibly resulting in a ``coaster''. You should therefore either 
upgrade the port when you upgrade your system, or if you are tracking 
-stable, upgrade the port when a new version becomes available.

While cdrecord has many options, basic usage is even simpler than burncd. 
Burning an ISO 9660 image is done by:

    # cdrecord dev=device imagefile.iso

The tricky part of using cdrecord is finding the dev to use. To find the 
proper setting, use the -scanbus flag of cdrecord, which might produce 
results like this:

    # cdrecord -scanbus
    Cdrecord 1.9 (i386-unknown-freebsd4.2) Copyright (C) 1995-2000 Jörg 
Schilling
    Using libscg version 'schily-0.1'
    scsibus0:
            0,0,0     0) 'SEAGATE ' 'ST39236LW       ' '0004' Disk
            0,1,0     1) 'SEAGATE ' 'ST39173W        ' '5958' Disk
            0,2,0     2) *
            0,3,0     3) 'iomega  ' 'jaz 1GB         ' 'J.86' Removable Disk
            0,4,0     4) 'NEC     ' 'CD-ROM DRIVE:466' '1.26' Removable 
CD-ROM
            0,5,0     5) *
            0,6,0     6) *
            0,7,0     7) *
    scsibus1:
            1,0,0   100) *
            1,1,0   101) *
            1,2,0   102) *
            1,3,0   103) *
            1,4,0   104) *
            1,5,0   105) 'YAMAHA  ' 'CRW4260         ' '1.0q' Removable 
CD-ROM
            1,6,0   106) 'ARTEC   ' 'AM12S           ' '1.06' Scanner
            1,7,0   107) *

This lists the approriate dev value for the devices on the list. Locate your 
CD burner, and use the three numbers separated by commas as the value for 
dev. In this case, the CRW device is 1,5,0, so the appriate input would be 
dev=1,5,0. There are easier ways to specify this value; see the cdrecord(1) 
for details. That is also the place to look for information on writing audio 
tracks, controlling the speed, and other things.

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