If you are running an emulator on an Android phone or a low-end laptop, storage is precious. A compressed ISO takes up less room on your hard drive or SD card, leaving more space for other classic games.
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Storage management is a top priority for gamers using Steam Decks, retro handhelds (like the Anbernic or Retroid series), or mobile phones. A standard PS2 DVD can hold up to 4.7GB of data, but many games—including Rumble Racing—don't actually use all that space.