Instructions to Create ISO CD/DVD Image (.iso) within Mac OS X

1. Insert CD/DVD source.

2. Fire up a Terminal, you can then determine the device that is you CD/DVD drive using the following command:
$ drutil status
 Vendor   Product           Rev

           Type: DVD-ROM              Name: /dev/disk1
   Cur Write:    8x DVD          Sessions: 1
   Max Write:    8x DVD            Tracks: 1
   Overwritable:   00:00:00         blocks:        0 /   0.00MB /   0.00MiB
   Space Free:   00:00:00         blocks:        0 /   0.00MB /   0.00MiB
   Space Used:  364:08:27         blocks:  1638627 /   3.36GB /   3.13GiB
   Book Type: DVD-ROM

Note: For steps 3 and 4 below, replace /dev/disk1 with the device path that your system lists (Example: /dev/disk1, /dev/disk2, etc).

3. Umount the disk with the following command:
$ diskutil unmountDisk /dev/disk1
Disk /dev/disk1 unmounted

4. Create the ISO file with the dd utility (Will take some time):
$ dd if=/dev/disk1 of=file.iso bs=2048

5. Test the ISO image by mounting the new file (or open with Finder):
$ hdid file.iso