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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.
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3291915 news items

Chicago Tribune

Chicago Tribune
Fri, 12 Dec 2014 08:26:49 -0800

This wasn't surprising, since the Pittsburgh Symphony music director has been proving his knack for enlivening the tried-and-true ever since his CSO debut a dozen years ago. There were times on Thursday when the biting exuberance of Honeck's ...

Talkin' Cloud

Talkin' Cloud
Tue, 16 Dec 2014 07:00:00 -0800

The New Year is still a few weeks away, but 2015 is already shaping up to be rough for chief security officers (CSOs). After waves of high-profile attacks against major corporations and governments in 2014, many firms are rightly concerned about their ...

Chicago Tribune

Chicago Tribune
Mon, 08 Dec 2014 11:30:00 -0800

The San Francisco orchestra announced Izotov's appointment Monday without mentioning the Russian-born oboist has not resigned his post in Chicago and will continue in that capacity through the present CSO season. Earlier this year Izotov won the ...

Irish Independent

Irish Independent
Thu, 18 Dec 2014 18:26:15 -0800

The figures, which form part of the CSO's annual enterprise society statistics, also reveal that Irish companies are gradually moving over to the internet to purchase goods and services. And 69pc of large Irish businesses now purchase online, making up ...

CSO Online

CSO Online
Mon, 15 Dec 2014 06:30:35 -0800

Documents leaked by the group claiming responsibility for the attack on Sony Pictures show that the company has upwards of $60 million in cyber insurance coverage after consolidating coverage with Sony Corporation of America. But will that be enough?

Chicago Classical Review

Chicago Tribune
Fri, 05 Dec 2014 08:37:49 -0800

Metzmacher has achieved his most convincing CSO performances in the past on behalf of the 20th century orchestral repertory. You would expect as much from a musician who once led a famous series of concerts and recordings in Germany called "Who's ...

CSO Online

CSO Online
Mon, 15 Dec 2014 15:22:56 -0800

Employees who have spoken to CSO have stated that network access is limited, and several systems used for day-to-day operations are still offline. Staff are relying on weak Wi-Fi signals, Verizon Mobile Hot Spots, and a backup e-mail service that only ...

Chicago Classical Review

Chicago Tribune
Fri, 21 Nov 2014 07:56:40 -0800

He had no trouble transferring his ideas about balance, scale, articulation and phrasing to the various CSO soloists and accompanying chamber groups, leaving them free to realize the tonal possibilities of working in their natural musical environment.

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