How to Create ISO Image from CD/DVD Using OS X Terminal

1. Check which device name your DVD/CD drive has (use this name for the rest of the commands):
   • “drutil status”
   • Should be something like “/dev/disk2”
2. Unmount the drive:
   • “diskutil unmountDisk /dev/disk2”
   • There should be a message similar to: “Unmount of all volumes on disk2 was successful.”
3. Use dd to create the ISO image:
   • “dd if=/dev/disk2 of=filename.iso bs=2048”
   • Syntax is quite simple; if = input file, of = output file.
4. Building of ISO image might take around 10 minutes, depending of course of your CD/DVD size.