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Disc images (commonly known as ISOs , but ISO is actually a specific format) are faithful software recreations of game discs(when made correctly). However, with disc sizes ranging from 700 MB (CD), 1.4 GB (GC Mini-DVD), 4.7 GB (single-layered DVD), and 25 GB (Blu-Ray), they can get pretty taxing for storage, especially when newer generations of consoles games are getting bigger in file sizes.
It wouldn't be so bad if not for the fact that the game data itself is often times only a fraction of the actual disc size - for instance, the ''Super Mario 25th Anniversary'' Wii disc itself is a 4.7GB, when really the actual game data is only a single SNES ROM (12 MB of useful data, to be precise) and nothing else. Naturally, one would want to trim this extra "fat" as much as possible, which is what this page aims to help to achieve. Most of the information here is based partially on this [https://www.reddit.com/r/emulation/comments/3g933n/guide_reduce_the_size_of_your_ps2_gc_wii_x360_ds/ guide].
