Make a bootable ISO from an install CD/DVD in Linux

It’s been a while since I last did this but you never know when you might need it.  When you see a “dd” command, you better make sure you know what you are doing.  In other words, don’t type this just as you see it!

Identify where CD/DVD is mounted:


Unmount the CD/DVD:

umount /dev/sr0

Copy data from CD/DVD to ISO file:

dd if/dev/sr0 of=~/image.iso

Or use dcfldd if you prefer:

dcfldd if/dev/sr0 of=~/image.iso