A standard Bully: Scholarship Edition ISO for the PSP is approximately . A "highly compressed" version reduces this file size—often down to 300 MB to 600 MB —using advanced compression algorithms like CSO (Compressed ISO) or archiving formats like ZIP, RAR, or 7z.

If you are managing other PSP titles and want to save space using compression, here is how the process works: File Formats : Standard games use files. To save space, these are converted into .CSO (Compressed ISO) Compression Levels : Using a tool like PSP ISO Compressor , you can set the compression to