Blu-ray, also known as Blu-ray disc (BD), is optical disc storage medium designed to supersede the DVD format. Same as DVDs and CDs, Blu-ray disc has a standard physical medium, namely 12 cm plastic optical disc. It offers more than five times the storage capacity of traditional DVDs and can hold up to 25GB on a single-layer disc and 50GB on a dual-layer disc. This extra capacity combined with the use of advanced video and audio codecs will offer consumers an unprecedented HD experience.

ISO refers to the International Organization for Standardization. An ISO image is an archive file which is also known as a disc image of an optical disc. ISO image files typically have a file extension of .iso. It is composed of the data contents of every written sector of an optical disc, including the optical disc file system. ISO image files contain all the data on the archived CDs, DVDs, Blu-ray Discs, etc. They are stored in an uncompressed format and it's a true digital copy of the original. What's more, Any CD or DVD can be archived by.