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Create an exact duplicate of a CD from the command line
Authored by: adrianm on Jan 15, '04 04:29:48PM
On my mac, I often do this:

hdiutil convert /dev/disk3s0 -format UDTO -o imagefile
This will create a master disk image which can be used to burn again.

Presumably this is what Disk Utility does though, so maybe the hints here are better.

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Create an exact duplicate of a CD from the command line
Authored by: seanstar on Jul 19, '04 02:38:11PM

the issue I've run into with hdutil convert is that it does just that- it converts. It takes an existing set of files in one filesystem and puts them into an image in another filesystem. This is fine for making isos to be read/burned for Windows, Linux or other common OSs, but not so hot for getting all the nuances of an existing format. I'd imagine dd could be used to directly copy discs that don't even have a filesystem OSX can read (OS/2 HPFS anyone?)



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