Accurately ripping ISO 9660 CDs on a modern Mac

2016-08-28 15:53:35 UTC

Here’s how diskutil list describes a CD-ROM I bought at the Big Book Sale in Fort Mason:

/dev/disk14 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:        CD_partition_scheme                        *97.5 MB    disk14
   1:     Apple_partition_scheme                         84.9 MB    disk14s1
   2:        Apple_partition_map                         1.5 KB     disk14s1s1
   3:                        ISO                         46.1 KB    disk14s1s2
   4:                  Apple_HFS Operation Neptune CD    84.5 MB    disk14s1s3

This is an ISO 9660 “hybrid” disc. It presents a Mac volume when mounted on a Mac and a DOS/Windows volume when mounted on a DOS or Windows machine.

The HFS volume here is a fiction; the real ISO 9660 volume (despite its name of “Apple_partition_scheme”) is disk14s1—the first partition.

If you copy this partition, with something like:

sudo cp /dev/disk14s1 Operation_Neptune.iso

You will then have an accurate ISO 9660 disk image that you can mount on your Mac, and thus see the Mac contents, or on your DOS or Windows machine, and see those contents.

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