Some files are stored as .7z or .rar, then decompress to a much larger ISO. But a “highly compressed” playable file (e.g., .cso) cannot exceed 70% reduction without quality loss.
Platform Tested On: PPSSPP (emulator) / Custom Firmware PSP
Compression Source: Fan-repacked .CSO / .ISO (size reduced from ~1.2GB to ~200–400MB)
A 200 MB file downloads in minutes, not hours. For preservationists archiving old games, bandwidth is a resource worth saving. Naruto Ultimate Ninja Heroes 2 Highly Compressed
| Feature | Original ISO (Uncompressed) | Highly Compressed (CSO) | | :--- | :--- | :--- | | File Size | 1.1 GB – 1.5 GB | 150 MB – 300 MB | | Character Roster | 50+ | 50+ (Full) | | Story Mode | Full | Full | | Load Times | Fast (2 sec) | Moderate (3-4 sec) | | Audio Quality | 320kbps | 320kbps (If done right) | | Storage Space Left | Limited | Plentiful |
Use CISO (Compressed ISO) tool or UMDGen: Some files are stored as
.CSO.Result: ~200–220 MB file, 100% of original content.
⚠️ Warning: Extremely small files (under 100 MB) are often fake, corrupted, or contain malware. A 200 MB file downloads in minutes, not hours
Because the compressed file requires the CPU to decompress data on the fly, a tiny tweak is needed for the best experience:
Some files are stored as .7z or .rar, then decompress to a much larger ISO. But a “highly compressed” playable file (e.g., .cso) cannot exceed 70% reduction without quality loss.
Platform Tested On: PPSSPP (emulator) / Custom Firmware PSP
Compression Source: Fan-repacked .CSO / .ISO (size reduced from ~1.2GB to ~200–400MB)
A 200 MB file downloads in minutes, not hours. For preservationists archiving old games, bandwidth is a resource worth saving.
| Feature | Original ISO (Uncompressed) | Highly Compressed (CSO) | | :--- | :--- | :--- | | File Size | 1.1 GB – 1.5 GB | 150 MB – 300 MB | | Character Roster | 50+ | 50+ (Full) | | Story Mode | Full | Full | | Load Times | Fast (2 sec) | Moderate (3-4 sec) | | Audio Quality | 320kbps | 320kbps (If done right) | | Storage Space Left | Limited | Plentiful |
Use CISO (Compressed ISO) tool or UMDGen:
.CSO.Result: ~200–220 MB file, 100% of original content.
⚠️ Warning: Extremely small files (under 100 MB) are often fake, corrupted, or contain malware.
Because the compressed file requires the CPU to decompress data on the fly, a tiny tweak is needed for the best experience: