How to create ISO file from CD/DVD on MAC

1. Use drutil utility to check the CD/DVD mount point after you insert the CD/DVD

drutil status
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MATSHITA DVD-R UJ-898 HC10

Type: CD-ROM Name: /dev/disk3
Sessions: 1 Tracks: 21
Overwritable: 00:00:00 blocks: 0 / 0.00MB / 0.00MiB
Space Free: 00:00:00 blocks: 0 / 0.00MB / 0.00MiB
Space Used: 75:37:25 blocks: 340300 / 696.93MB / 664.65MiB
Writability:
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2. Now you will need to umount the disk with the following command (use the discx for unmounting the disk as you see in Name field above:

diskutil unmountDisk disk3

3. Now you can write the ISO file with the dd utility:

dd if=/dev/disk3 of=file.iso

4. When finished you will want to remount the disk:

diskutil mountDisk disk3