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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]

References[edit]

  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.
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Chicago Tribune
Sun, 27 Jul 2014 08:33:45 -0700

But with conservative programming now being the norm in both the CSO's downtown and North Shore seasons, Saturday's concert – 90 minutes long, without an intermission -- seemed more like business as usual than an artificial sweetener served on the ...
 
Xconomy
Thu, 24 Jul 2014 06:57:42 -0700

Krieg, meanwhile, is a well-known figure in RNA therapeutics, and left his post as CEO of Cambridge startup RaNa Therapeutics to take over the CSO role at Sarepta in January. The move helped validate the already-ascending Sarepta, to an extent: Krieg ...
 
Chicago Tribune
Tue, 22 Jul 2014 14:22:30 -0700

"Bill was a very special person in our lives," said retired CSO cellist Don Moline, who also played with him in the Chicago Arts Quartet. "Bill was a very compassionate human being in the sense that he always cared about his colleagues and his wife ...
 
Chicago Daily Herald
Sat, 26 Jul 2014 03:07:30 -0700

Violinist Joshua Bell will perform with the Chicago Symphony Orchestra at the Ravinia Festival in Highland Park. The 43rd Aurora Puerto Rican Heritage Festival is set at RiverEdge Park in Aurora Saturday and Sunday, July 26 and 27. Daily Herald File Photo.
 
CSO Magazine
Sun, 27 Jul 2014 23:11:15 -0700

IT and security leaders should arm themselves with details about the location of their corporate data and use a growing comfort with cloud computing to address policy concerns about data sovereignty, a recent Gartner analysis has recommended.
 
The Denver Post
Fri, 25 Jul 2014 16:37:30 -0700

Between Bach and a hard place on Boettcher, CSO. By The Denver Post Editorial Board. Posted: 07/25/2014 05:35:49 PM MDT. Updated: 07/25/2014 05:35:56 PM MDT. People walk through the Denver Center for the Performing Arts as the Colorado ...
 
WNDU-TV
Fri, 25 Jul 2014 13:26:15 -0700

The project will prevent millions of gallons of untreated wastewater from entering the Elkhart River every year. It's expected the project will reduce sewer overflow from 45 times a year to six times a year. It will also eliminate 8.4 million gallons ...

Chicago Classical Review

Chicago Classical Review
Wed, 23 Jul 2014 14:57:38 -0700

The CSO members were at their considerable best including clarinetist John Bruce Yeh and cellist Daniel Katz with especially tender and sensitive violin playing from Sylvia Kilcullen. The rest of the program offered all Ravinia premieres. Hanns Eisler ...
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