Create an iso image on a Mac

The steps I use to create an ISO image on my Macs.

## make an iso on the command line
## use the exact slice, use df to check
drutil status  # look for Name: /dev/disk*
diskutil unmountDisk /dev/disk
dd if=/dev/disk of=/Users/Shared/Software/name-of-iso bs=2048
# then test with finder/disk util/etc.