Just 3 days ago I burned an ISO to a CD using standard Windows tools (Win 11), and booted from the CD, and it worked.My test bench machine is a Latitude E6440 and for whatever reason it will not see the USB SATA dock that is plugged into if I boot off of a SpinRite USB stick, but will be detected if I boot off internal optical media.
Either way, I'm hoping that it may be an isolated incident with my environment and not a larger issue where people can't boot their SpinRite optical media.
Otherwise, I certainly agree, USB sticks all the way, and my tool kit is a very well worn (chrome right off the finish) Kingston SE8 DataTraveler that I've copied all my IT tools onto after SpinRite did its magic to it.
I did this because I wanted to see if my Mac could boot from that CD - it couldn’t but I think that’s because I have a bad CD drive on my Mac, not because the CD I made was bad)