Why is the md5 iso-image different from the burnt disc?

Question

linux

There is a directory with files. From them, I create an image:

genisoimage 1>/dev/null -o name.iso -l -dir-mode 777 -new-dir-mode 777 -r -iso-level 3 -J -joilet-long -jcharset UTF-8 -v -V name -publisher CompanyName -p DepartmentName --allow-limited-size ./path/name

I burn this image to disk (we recorded it on another machine under Windows using ImgBurn).
I insert this disk into my PC, I do:

md5sum /dev/sr0 > md5sum.txt 
md5sum name.iso >> md5sum.txt 
cat md5sum.txt

And I get completely different hash sums.
Why is that?

Answer 1

I have a suspicion that you are not getting the contents of the device. Try to dd back to the file from the device and then compare