Under FreeBSD, data on conventional hard disks is stored in the UNIX File System or
UFS format. CD-ROMs and CD-Rs use a different file system, the ISO 9660 format,
which is compatible with other systems. This is not a problem when you mount a CDROM:
FreeBSD includes a read-only ISO 9660 file system. When you want to write a
CD-R, however, things are a little more complicated: the medium requires you to write
the entire file system at once, and since the file system is stored in a different format, you
can’t just copy the UFS file system. Instead, you must first create an image of...