.CSO File Description

.CSO is a compression method for the ISO image format. It is used to compress dumped PlayStation Portable UMD games, and is an alternative to the .DAX compression method.

At one time, .DAX was the compression standard among PSP games. However, with the wildly popular homebrew application "DevHook" using the .CSO compression standard, .CSO has become more popular. Due to decompression, one may also experience slightly longer loading times when playing .CSO games instead of ISO image format.

CSO provides nine levels of compression. While the highest levels of compression can introduce slowdown and lengthy load-times in software which relies heavily on disc streaming, even the lower levels are capable of substantial compression. This is partially due to the data layout of a UMD, though more frequently due to the use of Dummy Files as both an anti-piracy tool and a means to more optimally lay the data out physically on the disc.

-

Other Information For .CSO File Extension

• Company:

  N/A

• File Type:

  CISO Compressed ISO CD Image File

• Identifying Characters (Hex):

  43 49 53 4F

• Identifying Characters (ASCII):

  CISO