1. Insert CD/DVD
2. Open a terminal window and use the following command to determine your DVD device:
$ drutil status
Vendor Product Rev
HL-DT-ST DVDRW GSA-S10N AP09
Type: DVD-ROM Name: /dev/disk1
3. Umount the disk with the following command:
$ diskutil unmountDisk /dev/disk1
Disk /dev/disk1 unmounted
4. Use the dd command to create the ISO file:
$ dd if=/dev/disk1 of=file.iso bs=2048
5. Mount the ISO file to verify that it is readable:
$ hdid file.iso
If you’re looking for a utility to allow you to read ISO files on the Windows platform, try Virtual Clone drive from SlySoft.