digplanet beta 1: Athena
Share digplanet:


Applied sciences






















Compressed ISO
Filename extension .cso
Internet media type application/x-compressed-iso
Developed by Booster
Type of format Disk image
Container for ISO images

.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. It is also sometimes called "CISO".

It was the first compression method for ISO. It was created so that more memory space can be saved. Booster created the first code; it was later optimized for better compression. Other formats tried to replace it by fixing up certain issues such as lag in games, such as .DAX and .JSO. However at the time, the popular application homebrew "DevHook" used CSO. .DAX needed another loader, and .JSO was basically unused.

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.[1] 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.

In addition to being used for compressing PlayStation Portable UMD games, the PSP port of PicoDrive supports compressed Sega Mega-CD disc images in the CSO format.[2]


  1. ^ "CSO compression". Archived from the original on 23 February 2008. Retrieved 2008-02-28. 
  2. ^ "PicoDrive for PSP v1.35b - bugfixes and major feature added". Archived from the original on 12 December 2007. Retrieved 2007-12-11. 

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/.CSO — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
5066 videos foundNext > 

How To Convert .ISO files to .CSO PSP

umdgen: http://dl.qj.net/psp/homebrew-applications/umdgen-v400.html winrar: http://rarlab.com.

como poner juegos .cso a psp

No tengo links pero conque pongan esto ... (Ej.descargar motor strom .cso)

descargar god of war ghost of sparta para psp .cso HD

Hola amigos de YouTube, esta vez les regalo el juego de God Of War Ghost Of Sparta para psp en formati .iso... SUSCRIBETE AL NUEVO CANAL PARA MÁS VIDEOS :) h...

emulador de psp para pc instalar y meterle juegos .iso .cso

Hola!¡ amigos de youtube,les traigo este emulador de psp para la computadora "JPCSP" el video fue creado por mi DISFRUTENLO :D OJO:revisen de cuantos "bit" e...



PSP .iso und .cso Dateien abspielen CFW 6.39;6.35;6.20 PRO

6.39 Pro: http://www1.zippyshare.com/v/9096144/file.html 6.35 Pro: http://www1.zippyshare.com/v/15790940/file.html 6.20 Pro: http://www1.zippyshare.com/v/582...

(AMV) Crisis Core Final Fantasy VII (Links de descarga del juego .Cso en la Descripción)

Sinopsis: CRISIS CORE Final Fantasy VII (PsP) es la precuela del juego Final Fantasy VII para PSone. Esta vez el juego estara protagonizado ya no por Cloud, ...

comprime tus juegos .iso a .cso para psp.

link de descarga http://www.mediafire.com/?zzkvckky23z.

Psp videos,how to make a .cso from a umd_bat.bin file and a game folder

Here is an easy way on how to make a .cso or a psp game from a umd_bat.bin and a game folder. 1.download games at www.pspisoz.com 2.any questions pelase pm m...

Como tener mucho dinero en Midnight Club 3 Dub Edition PSP (.CSO)

LINK DE DESCARGA RECUERDEN QUE SOLO SOLO SE PUEDE ESTE TRUCO EN (.CSO) (tiene que estar en memoria) http://dl.qj.net/psp/homebrew-applications/cwcheat-022-re...

5066 videos foundNext > 

24750 news items

Wed, 17 Sep 2014 07:26:15 -0700

More details will be announced. One City, One Symphony Radio broadcasts. Classical radio WGUC-FM (90.9) will present six radio broadcasts of the works on the "One City, One Symphony" program leading up to the CSO performances. Hear "Hymne à la ...
Chicago Tribune
Tue, 16 Sep 2014 06:44:38 -0700

Jeff Alexander, Deborah Rutter's successor as CSO association president, won't be on board here until just after the New Year. Before then, two key positions in the executive hierarchy – vice president for artistic planning, and director of artistic ...
West Seattle Blog (blog)
Wed, 17 Sep 2014 17:05:31 -0700

Now that the contractor has completed secant pile installation, crews will begin digging to clear space for the underground storage tank tomorrow, September 18, 2014. Excavation will be complete by early 2015. Crews will dig out an area about 80 feet ...
CSO Online
Wed, 17 Sep 2014 10:05:25 -0700

While their most recent findings could raise alarm, this isn't a moment where the public should freak out, said Turner during an interview with CSO. "This is a moment to say look, if you're a high value target, or if you have high-value information ...


Chicago Tribune
Tue, 02 Sep 2014 06:13:50 -0700

Sources close to the situation said Alexander, who has been leading Canada's third largest symphony orchestra since 2000, was chosen with CSO music director Riccardo Muti's backing after a lengthy selection process. In December the Kennedy Center for ...
Sun, 14 Sep 2014 13:03:45 -0700

Review: Lang Lang brings flash to CSO season kick-off. If Lang Lang's performance of Beethoven's Piano Concerto No. 1 had everything to do with flash and little to do with Beethoven, no one seemed to mind in the sold-out crowd. Loading… Post to ...

Chicago Classical Review

Chicago Tribune
Wed, 03 Sep 2014 14:17:53 -0700

The board was informed that Alexander's Vancouver Symphony Orchestra contract requires him to give six months' notice to his current employer, but with the VSO having been cooperative throughout this process, CSO announced that his term would begin ...
CSO Online
Mon, 15 Sep 2014 06:41:15 -0700

What goes through the mind of a CSO/CISO upon being told by his or her team that their organization has been breached? This is not an idle or theoretical question. It seems that almost every day brings news of yet another breach of a high-profile ...

Oops, we seem to be having trouble contacting Twitter

Talk About .CSO

You can talk about .CSO with people all over the world in our discussions.

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!