about roms

There should be a way to have them in their original forms without compressing them cause I cant play the roms if their compressed the small roms are not bad anyway should not need to be compressed but those big ones like ps 3 xbox 360s or what ever their how much it takes to install them they should all be kept in their original forms on how much it takes to install them if you compress them than it takes longer to load the rom if you want to play that rom and i cant go messing around with that stuff trying to fix them and make it back to what it was to download them in the first place we should not have to compress any file there should be a way to keep them in their original forms