gpdvd

Been through all the help and can't seem to find this one. If I have a dump of a blu-ray disc on a hard drive and create a .iso file with ImgBurn, and sometime in the future I wish to convert the iso back to the hard drive original, how is this achieved? ImgBurn only gives you options (that I can see) for writing an iso to optical media. It's possibly really obvious but I can't seem to find it. Regards and Thanks