are only compliant with this specification when they are stored in DD or CISO (Compact ISO) format media files. When burned to CD/DVD media or when stored in other media container file formats such as NRG or DAA, the combination is not CFS compliant and should not be referred to as a CFS file. Note: Compact ISO is not the same format as the [[compressed ISO]] format common in PlayStation Portable homebrew development. The PSP compressed ISO format is also referred to as CISO, but the file extension is CSO. CFS writing applications should default to writing DD format media container files unless the user has specified container file options that require CISO (spanning, compression, ...). This provides more intuitive interchange with systems and applications that support DD CD/DVD images but do not support CFS. See also Comparison of archive formats List of archive formats Free file format Open format References External links CFS, Compact File Set at Pismo Technic Archive formats