CASC Conversion in 6.0.2

General Discussion
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As previously announced, the Warlords of Draenor 6.0.2 pre-patch marks our transition to the new “Content Addressable Storage Container” (CASC) file format system. This transition is an automatic process that will occur through the Battle.net desktop app as it installs Patch 6.0.2. While it shouldn’t require any action on your part, we have a few notes on the process that can help ensure a smooth install.

  • By default your Battle.net desktop app is set to download future patch data automatically. If you’ve turned yours off we recommend re-enabling it to download the 6.0.2 patch data. It’s a pretty big patch, and starting now will save you precious Iron Horde-killing time on Tuesday. Your background download settings are configurable per-game, and you can also adjust things like download speed, among other settings.


  • There will be one small final patch on 6.0.2 release-day that will include the last few files to install the patch. Right now we’re expecting it to be around 100MB.


  • If you’re one to leave your computer on and Battle.net desktop app running, on the morning of the patch release the install and conversion to CASC will happen automatically.


  • Hard drive fragmentation can slow down just about anything you do on your computer, but especially when a program needs to move around large data files, like this patch and conversion process will need to. If you haven’t defragged your hard drive in a while, we recommend looking into it as a possible install-time saving preparation step. Note that defrags aren't typically necessary or recommended if using an SSD.


  • If you’re coming back to the game and looking to reinstall from scratch, be aware that all game discs out in the world are printed using the old MPQ file format. That means that if you attempt to install from those discs after 6.0.2, the Battle.net desktop app will instead install by downloading the game. That’s of course not necessarily a bad thing, especially because downloading can actually sometimes be faster than a disc install. Discs being printed for Warlords of Draenor, and for future “Battle Chests”, will be printed in the CASC format and they’ll be able to be used to install from as before.




While we've tried to ensure as speedy a conversion as possible by using most of your existing game data, this is a complex process, and depending on your hardware, hard drive fragmentation and free space, among other factors, this still may take a bit of time to complete. We hope some of these hints help cut that down even further.
Doomed! We're all doomed!
Thanks, Bashiok!
I bought an SSD last weekend to speed up this process. Can't wait for Tuesday!
I'm looking forward to seeing the new technology on live.
For future "Battle Chests", how will the consumer know if the discs in that specific box are MPQ or CASC?
interesting
Thank you
You might want to mention that defragmenting an SSD is not necessary and at best will decrease the lifespan of the drive.
People using Solid state drives do not need to defrag them!
10/10/2014 12:28 PMPosted by Bashiok
will save you precious Iron Horde-killing time on Tuesday


Good, soon I will be Ambassador of the Iron Vanguard
10/10/2014 12:28 PMPosted by Bashiok
As [url="http://us.battle.net/wow/en/blog/13645405"]previously announced[/url], the Warlords of Draenor 6.0.2 pre-patch marks our transition to the new “Content Addressable Storage Container” (CASC) file format system. This transition is an automatic process that will occur through the Battle.net desktop app as it installs Patch 6.0.2. While it shouldn’t require any action on your part, we have a few notes on the process that can help ensure a smooth install.

  • By default your Battle.net desktop app is set to download future patch data automatically. If you’ve turned yours off we recommend re-enabling it to download the 6.0.2 patch data. It’s a pretty big patch, and starting now will save you precious Iron Horde-killing time on Tuesday. Your background download settings are configurable per-game, and you can also adjust things like download speed, among other settings.


  • There will be one small final patch on 6.0.2 release-day that will include the last few files to install the patch. Right now we’re expecting it to be around 100MB.


  • If you’re one to leave your computer on and Battle.net desktop app running, on the morning of the patch release the install and conversion to CASC will happen automatically.


  • Hard drive fragmentation can slow down just about anything you do on your computer, but especially when a program needs to move around large data files, like this patch and conversion process will need to. If you haven’t defragged your hard drive in a while, we recommend looking into it as a possible install-time saving preparation step. Note that defrags aren't typically necessary or recommended if using an SSD.


  • If you’re coming back to the game and looking to reinstall from scratch, be aware that all game discs out in the world are printed using the old MPQ file format. That means that if you attempt to install from those discs after 6.0.2, the Battle.net desktop app will instead install by downloading the game. That’s of course not necessarily a bad thing, especially because downloading can actually sometimes be faster than a disc install. Discs being printed for Warlords of Draenor, and for future “Battle Chests”, will be printed in the CASC format and they’ll be able to be used to install from as before.


  • If you encounter any problems with the install or conversion please visit our [url="http://us.battle.net/wow/en/forum/1011701/"]Technical Support forum[/url]. For additional troubleshooting instructions or to speak with Blizzard support please use the [url="https://us.battle.net/support/en/article/install-troubleshooting"]Battle.net Support site[/url].


While we've tried to ensure as speedy a conversion as possible by using most of your existing game data, this is a complex process, and depending on your hardware, hard drive fragmentation and free space, among other factors, this still may take a bit of time to complete. We hope some of these hints help cut that down even further.


Will the new CASC system allow for simple folder based sound and font modding like the current MPQ system does?

Example being swapping the gun sounds by placing a new file named "GunFire01.ogg" in

//World of Warcraft/Data/Sound/Item/Weapons/Gun/
10/10/2014 12:35 PMPosted by Kyplor
For future "Battle Chests", how will the consumer know if the discs in that specific box are MPQ or CASC?

If it includes Warlords of Draenor it's CASC. Any that are Mists of Pandaria or older (there won't be older for long actually) will be phased out and recalled if they are MPQ so that they can send the CASC prints to retail stores. I would expect before Christmas time no major retail store (except used game stores) will be selling the MPQ prints for the MoP (and Cata if they even bother selling them) battle chests.
A quick reminder for all those people who have WoW on a SSD. Make sure you have room for this process. If you can move WoW to your hardrive, do that than move it back to your SSD after the process is complete. But this should only be done if you are tight on free space for your SSD.

Anything else just let it be & you should be fine :D.

Also don't forget to update the file location of your WoW folder in the battle net desktop app aswell. Both when you move it out & move it back into the SSD.
10/10/2014 12:28 PMPosted by Bashiok
There will be one small final patch on 6.0.2 release-day that will include the last few files to install the patch. Right now we’re expecting it to be around 100MB.


Remember when 100 MB was enormous? Hah.
https://twitter.com/oliviadgrace/status/520660745437315073

If what Olivia is saying is true Bashiok, this plan really screws around with people in Australia and other countries where they have much smaller caps on downloads.
Curious about CASC - can we expect the total HD space used by WoW to go down as a result of this new file format, or will it stay about the same?
10/10/2014 12:33 PMPosted by Zoot
Doomed! We're all doomed!


So the Mayans were right, file storage systems will destroy us all.....
10/10/2014 12:46 PMPosted by Treeage
Curious about CASC - can we expect the total HD space used by WoW to go down as a result of this new file format, or will it stay about the same?


Apparently it's not removing the old files, so you're going to use more space.
10/10/2014 12:53 PMPosted by Fairadey
10/10/2014 12:46 PMPosted by Treeage
Curious about CASC - can we expect the total HD space used by WoW to go down as a result of this new file format, or will it stay about the same?


Apparently it's not removing the old files, so you're going to use more space.


Not entirely accurate. As the conversion processes each MPQ, it deletes it. At the end of the conversion you should be at or around the same folder size if you've already downloaded all of the 6.0.2 data to this point, and should only need around 4GB free for the conversion itself.

Something people have noted in testing though is a lack of "garbage collection", which would cleanup redundant files after new versions are installed. This is an issue mainly in a beta environment as constant (sometimes daily) updates are released and redundant data builds up very quickly, but it isn't something that will immediately result in a larger install upon release of 6.0.2. Implementing garbage collection is something our engineers are working toward.
Hey Bashiok! (Or anyone with a more equipped knowledge on this subject than I),
Just from reading it, does this mean that patching will be easier and more frequent, meaning small tuning updates will be easier as well and therefore happen more frequently?

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