Make a .iso from a CD or DVD on Snow Leopard

You can determine the device that is you CD/DVD drive using the following command:

drutil status

Vendor Product Rev
MATSHITA DVD-R UJ-825 DAM5

Type: CD-ROM Name: /dev/disk1
Cur Write: 16x CD Sessions: 1
Max Write: 16x CD Tracks: 3
Overwritable: 00:00:00 blocks: 0 / 0.00MB / 0.00MiB
Space Free: 00:00:00 blocks: 0 / 0.00MB / 0.00MiB
Space Used: 66:55:27 blocks: 301152 / 616.76MB / 588.19MiB
Writability:

Now you will need to umount the disk with the following command:

diskutil unmountDisk disk1

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

dd if=/dev/disk1 of=file.iso

When finished you will want to remount the disk:

diskutil mountDisk disk1

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