Deleting ISO files from laptop

[glorya]

I wish there was a category for "REALLY NEWBIES" because I would be at the top of the list. I am sure that this is such a simple question for 99.9% of you on this forum but please bear with me. I was successful using the video guide to copy a CD using my laptop. But then I thought, OK, what about the files that I copied onto my laptop so I could copy to CD. If I didn't realize this, I am sure that my hard drive would be full in a short time. So I searched my hard drive for an ISO file and found it. Also, would the same principle apply if I copied a DVD movie (assuming I was successful, that is)? Did I do OK?