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10.6: Automate the creation of ISO images
Authored by: Typhoon14 on Jul 31, '10 06:18:07PM

The hint about using "cat" actually works well (it does appear to have be be unmounted though [use diskutil unmount /dev/diskid]).

That said, it is a bit different. The original hint seems to be aimed at generating disk images that are fully standards-compliant ISO 9660/Joliet. The cat method will generate a sector-by-sector copy of the original media, but does not guarantee that it will be at al ISO-compliant.

That said, the original hint seems to guarantee ISO-compliance even if it means creating a copy that is different from the original. I'm not clear on why you would actually want to do this. A sector-by-sector copy of a disc with the .iso extension and any ISO 9660 variant or even a UDF filesystem works perfectly in most Disk Utilities on Mac, Windows, or Linux.

Another note regarding the "cat" method. It appears to be exactly what Disk Utility does when you Choose "CD/DVD Master" as the format. The original hint mentioned that doing this was cumbersome, but I don't really see how do this and change the extension to .iso and you will have an image that is every bit as ISO compliant as the source disc.



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10.6: Automate the creation of ISO images
Authored by: scifiman on Aug 02, '10 10:09:00AM
Another note regarding the "cat" method. It appears to be exactly what Disk Utility does when you Choose "CD/DVD Master" as the format. The original hint mentioned that doing this was cumbersome, but I don't really see how do this and change the extension to .iso and you will have an image that is every bit as ISO compliant as the source disc.
This is correct. A .cdr "CD Master" is just an .iso with a different extension. Change it to iso and burn away.

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