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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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31663 news items

 
Chicago Tribune
Fri, 24 Oct 2014 06:47:57 -0700

Victoria Hall, where the CSO performed, is an ornate jewel box built in 1893, with more than 1,500 seats on the floor and in two tiers of balconies as well as boxes positioned directly over the harp and horn players and two single rows running behind ...

Cincinnati.com

Cincinnati.com
Sat, 25 Oct 2014 09:30:00 -0700

An American masterpiece played by an American legend was just the thing needed to lift a concert out of the doldrums. Pianist André Watts delivered an electrifying performance of the rarely-heard MacDowell Piano Concerto No. 2 with the Cincinnati ...

Cincinnati.com

Cincinnati.com
Fri, 24 Oct 2014 16:03:45 -0700

The Cincinnati Symphony Orchestra's latest album, "Hallowed Ground," is listed in five categories on the early ballot leading up to the 57th Grammy Awards. One of the last public appearances made by Maya Angelou was onstage at Cincinnati's Music Hall, ...
 
Chicago Tribune
Wed, 22 Oct 2014 09:23:35 -0700

LUXEMBOURG — Something notable that wasn't widely noted Tuesday was that Riccardo Muti conducted his 200th concert with the Chicago Symphony Orchestra at the modern Philharmonie concert hall. The bulk of these performances have taken place ...
 
Chicago Tribune
Wed, 22 Oct 2014 13:20:56 -0700

The CSO — which arrived Wednesday in Geneva after performances in Warsaw and Luxembourg, with Paris and Vienna still to come — is on its first international tour since these rules took effect. CSO director of operations Heidi Lukas said she and ...

Chicago Classical Review

Chicago Tribune
Fri, 10 Oct 2014 08:08:18 -0700

The CSO artistic administration moved swiftly, engaging Scottish conductor Donald Runnicles to take over the weekend concerts here and in Urbana-Champaign, with only a partial change of program. He did so impressively at the concert heard Thursday ...
 
Charleston Post Courier
Fri, 24 Oct 2014 10:04:33 -0700

Charleston Symphony Orchestra concertmaster Yuriy Bekker conducted and performed on the second Masterworks program of the current season. Provided. It is entirely plausible that the first performances of Shostakovich's 5th Symphony could have gotten ...
 
Westseattleherald.com
Thu, 23 Oct 2014 20:00:00 -0700

The assembly and installation of a large crane to work on digging out part of the Murray Basin CSO project will delay traffic on Monday Oct. 27 for up to 15 minutes at a time King County officials said.
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