New File System: CASC

[oakley]

New File System: CASC
For many years, Blizzard games have used a file format called Mo'PaQ (MPQ for short) as a way to compress and store game files, but it has had a number of technical limitations. To address these, we're switching Diablo III over to our proprietary file format called CASC (Content Addressable Storage Container) in patch 2.2.0.

This new file format has lots of improvements that directly benefit players, including a self-maintaining file structure (which helps prevent errors during installation), a faster and more reliable patching process, the ability to hotfix game client data, and a whole lot more!

The first step in transitioning Diablo III players will be converting existing installs to the new file format when patch 2.2.0 goes live, while using as much of the existing installed data as possible to reduce additional downloads.

Note: This change only applies to the Windows/Mac version of Diablo III and Diablo III: Reaper of Souls, and will not affect the console versions of the game.

patch 2.2 will be released in 2 week at last official thread
@LAX isboxer will be supported for this changed file system?

[lax]

It sounds likely that they will rename the cache directory structure to not be Diablo III\Data_D3\PC\MPQs\Cache\, so ISBoxer will probably need a minor update to handle the new cache folder. When this goes to PTR (has it yet?) I can update ISBoxer to support the changed name.

Otherwise, no -- ISBoxer does not directly access or refer to any MPQ files.

[MiRai]

patch 2.2 will be released in 2 week at last official thread
@LAX isboxer will be supported for this changed file system?

World of Warcraft has been using the CASC system for almost 6 months and there's no issue, so I expect there to be no issue with D3 either. If there is I imagine Lax will fix it in mere hours (or less).

Lax ninja'd me, but submitting the post anyway.

[oakley]

thx LAX quickly and fair as always