Little-endian is assumed for fields larger than a byte. The CSO file format contains a 24-byte header, data blocks, and an index table. ![]() ![]() While the highest levels of compression can slow and lengthy load-times in software which depends heavily on disc streaming, Also the lower levels can perform substantial compression. The CSO is using Deflate compression having nine levels of presets, usually, each level can handle 2 KiB blocks individually. The enhancements were made from time to time for better compression. The CSO file format was the first compression method for ISO for saving more memory space. Software such as Prometheus and YACC are used to create the images. This format uses Deflate compression, which can include up to nine compression layers. The CSO is an alternative to the DAX compression method also known as CISO was the first method to compress the ISO files and is usually a preferred method for archiving PlayStation Portable stuff. ![]() cso extension is a compressed ISO image file.
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