CSO File Documentation

Overview

Feature Value
Format Name Compressed ISO (CSO)
Extension .cso
MIME Type application/x-ciso
Developed By Booster
Compression Lossy for audiovisual data, lossless for other data types
Used For Compressing PlayStation Portable (PSP) game ISOs
Advantages Reduces storage space
Disadvantages May increase loading times
Block Size 2048 bytes (default)
Maximum Compression Level 9
Multi-Volume Support No
Encryption No inherent encryption
Compatibility Primarily PSP emulators and specific custom firmware on PSP hardware
Conversion Tools Various software tools like CISO XP, UMDGen, etc.
Header Size 24 bytes
Magic Number "CISO"
Index Table Each block has an index in the header
Open Format Yes
Streaming Support No
File System Base ISO 9660 file system
Operating System Support Cross-platform