Note the use of sudo dd, without which I got a permissions error. Which then produced an ISO file that I could then just double click to mount. Sudo dd if=/dev/disk2s0 of=~/RHDisk.iso bs=2048 Instead, I found that I had to specify the slice number, in addition to the disk number, i.e. When double clicking the resultant ISO file, the DiskImageMounter utility gave the following error message: Produced an ISO that was not, thereafter, mountable 1. On Catalina, when trying to copy an old RedHat 6.2 install CD I found that using diskutil unmountDisk /dev/disk2 iso files are only readable but not writeable, and if one month later you issue a dd command that might overwrite an existing file, it actually will come back with a "Permission denied" error so that you won't overwrite that existing file. In addition, since dd can overwrite any existing file, so you might want to do chmod 444 *.iso so that all.
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