Is there a way to verify a CD image (.iso) after it has been burned (and either the CD burning software does not have a "verify" option, or it was not used at the time of burning)?

I tried ripping the CD using dd and comparing the md5sum of that image and the original, but they don't match. I didn't really expect them to, but I'm pretty sure this disc burned without errors (I just want to be sure since this is a master disc to be sent off to be duplicated).