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ISO
An ISO image file is a copy of a a CD-ROM, or in the case of a PSP game, a UMD. ISO refers to the ISO-9660 format. They are commonly called archive files or disk images. ISO stands for the International Organization for Standardization and the format is supported worldwide by software companies that publish programs or games for digital devices such as your computer or PSP.
CSO
A CSO file is a compressed ISO image file. They are used by the PSP system for games. PSP files that end with .cso are compressed ISO image files. ISO files are the most common form of disk image formatting, and they can be converted to CSO to save ROM space during game play.
Padding on PSP ISO
Padding is what a .pad file is called by computer programmers. PAD stands for portable application description. It is used by programmers to give descriptions and specifications of their software to online sources or websites, such as system requirements, price, file names, download URLs and contact information. The standard data format allows software programmers and website designers to make and maintain an automatic program listing, which saves them time.
Where Does it Go?
The PSP ISO needs to be saved in a ZIP file or compressed ISO so that anyone who downloads or uploads it can extract the file and retrieve the information from it. You may see files titled PAD_FILE.XML; these files are pad files. A copy of the pad file is on the website of the author or compressor of the PSP ISO that you downloaded. Every time there is an update to a program or your ISO, there will be a new version of a pad file on the program author's website to download. PAD files are compatible with XML web code, so that data in the file can be extracted by any XML toolkit that accesses it. This prevents the web designer from having to contact the original writer of the program to get the information he needs to post the program on his website, saving time and in some cases, money.