ISOs occupy the exact technical size of the blue-ray sector dump. If your folder game was 12GB, the resulting ISO might register slightly higher due to padding structures required for disc parity. This is normal behavior.
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The PS3 uses a proprietary file system that doesn't easily run copied files. When backing up games, they often appear in a "folder" structure (containing PS3_GAME , PS3_UPDATE , etc.). While managers like can run these, converting them to PKG files or ISO offers several advantages. ISOs occupy the exact technical size of the