![]() ![]() Although the lack of this data won't affect the game files, the uncompressed ISO won't match the source file anymore and thus these formats are considered lossy compression. This happens because the unused space on GameCube/Wii games is always filled with pseudo-random data that is useless to the game.Ĭompression formats like WBFS, CISO and GCZ (when used to compress Wii discs) simply discard all of that random data in order to achieve smaller ISOs without actually touching the game files, but, if you then uncompress the ISO back to its plain format, it'll be missing the pseudo-random data. a plain ISO of Luigi's Mansion has 1.35 GB even though the actual game files takes just about 150 MB of the disc, same with Super Mario Galaxy 2 where the game files takes just about 1.2 GB of the full 4.37 GB plain ISO). GameCube and Wii disc images always have the same size, even if the game files doesn't use the entire space available on the disc (e.g.
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