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Old November 18th, 2012, 10:32 PM   #1 (permalink)
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Default 4.2 /sdcard and /sdcard/0 Observation

After flashing Jelly Belly v10.0, I was getting annoyed knowing that there were 2 different storage locations (/sdcard and /sdcard/0), so I looked into it and here's what I found:

I had 2 different directories under /sdcard. Inside /sdcard, I had the normal folders that Android and apps create (like Alarms, data, DCIM, etc...) as well as a folder named 0. Inside this /sdcard/0 folder, I had all of the folders I had pre 4.2 Jelly Bean, including the standard Android folders and all the folders I had created (folders I created to organize the ROMs, kernels, etc that I have on my sd card).

So it seems like when you flash your first 4.2 ROM, it creates a backup of your /sdcard directory under this /sdcard/0 folder. From then on, /sdcard becomes the default directory where Android functions.

Oddly enough, I found 3 virtual symlinks that had the same file structure. These locations were:

/storage/emulated/0 and /storage/emulated/0/0 (new and "backup" locations, respectively)
/storage/emulated/legacy and /storage/emulated/legacy/0 (new and "backup" locations, respectively)
/storage/sdcard0 and /storage/sdcard0/0 (new and "backup" locations, respectively)

In al, there were 4 locations that had the exact same data. I merged all of the /sdcard/0 "backup" folders to /sdcard so everything was in 1 location. Hope this helps someone and please share your own insights.

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Old November 18th, 2012, 11:16 PM   #2 (permalink)
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How do you like the rom?
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Old November 18th, 2012, 11:24 PM   #3 (permalink)
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How do you like the rom?
It's a good mostly stock ROM. It's moderately stable for me since jakeday incorporated 4.2, but before that it was stable as they come. I imagine it will get more and more stable with each release as he works out the bugs. See here for more info.
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Old November 19th, 2012, 02:49 AM   #4 (permalink)
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The file system is weird, especially with clockwork. The folder it looks for for backup/restores of nandroids is data/media/clockworkmod. Why is it looking there and not on the sd card? Then there's 4 locations of the same location (if that makes since), legacy folders, aaaaaaaaaaaah! Anyone got a explanation for why its done that way? Is it a 4.2 thing, or just jelly belly?
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Old November 19th, 2012, 03:20 AM   #5 (permalink)
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Anyone got a explanation for why its done that way? Is it a 4.2 thing, or just jelly belly?
It seems to be the general consensus that it has to do with jelly bean's ability to support multiple user profiles.
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Old November 19th, 2012, 03:23 AM   #6 (permalink)
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It seems to be the general consensus that it has to do with jelly bean's ability to support multiple user profiles.
So maybe the backup for user 1 is numbered "0" then "1" "2" and so on?
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Old November 19th, 2012, 09:41 AM   #7 (permalink)
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Originally Posted by NSutherl View Post
After flashing Jelly Belly v10.0, I was getting annoyed knowing that there were 2 different storage locations (/sdcard and /sdcard/0), so I looked into it and here's what I found:

I had 2 different directories under /sdcard. Inside /sdcard, I had the normal folders that Android and apps create (like Alarms, data, DCIM, etc...) as well as a folder named 0. Inside this /sdcard/0 folder, I had all of the folders I had pre 4.2 Jelly Bean, including the standard Android folders and all the folders I had created (folders I created to organize the ROMs, kernels, etc that I have on my sd card).

So it seems like when you flash your first 4.2 ROM, it creates a backup of your /sdcard directory under this /sdcard/0 folder. From then on, /sdcard becomes the default directory where Android functions.

Oddly enough, I found 3 virtual symlinks that had the same file structure. These locations were:

/storage/emulated/0 and /storage/emulated/0/0 (new and "backup" locations, respectively)
/storage/emulated/legacy and /storage/emulated/legacy/0 (new and "backup" locations, respectively)
/storage/sdcard0 and /storage/sdcard0/0 (new and "backup" locations, respectively)

In al, there were 4 locations that had the exact same data. I merged all of the /sdcard/0 "backup" folders to /sdcard so everything was in 1 location. Hope this helps someone and please share your own insights.
This was annoying me as well and i did the same thing you did. I like everything in one place. Glad you made a post about this before i did
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Old November 19th, 2012, 10:32 AM   #8 (permalink)
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So maybe the backup for user 1 is numbered "0" then "1" "2" and so on?
I think this is correct.
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Old November 19th, 2012, 02:21 PM   #9 (permalink)
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Originally Posted by Danielson2047 View Post
The file system is weird, especially with clockwork. The folder it looks for for backup/restores of nandroids is data/media/clockworkmod. Why is it looking there and not on the sd card? Then there's 4 locations of the same location (if that makes since), legacy folders, aaaaaaaaaaaah! Anyone got a explanation for why its done that way? Is it a 4.2 thing, or just jelly belly?

I've been watching the sdcard and file system changes since 2.1 and the /data/media is how almost all Linux distros mount external storage. Since Android is based on Linux, this is where the sdcard is ACTUALLY mounted. All the other locations you find are symlinks.
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Old November 19th, 2012, 02:49 PM   #10 (permalink)
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I've been watching the sdcard and file system changes since 2.1 and the /data/media is how almost all Linux distros mount external storage. Since Android is based on Linux, this is where the sdcard is ACTUALLY mounted. All the other locations you find are symlinks.
This makes sense now that I think about it. When doing a factory reset in TWRP, I've noticed that the script says "wiping data without wiping data/media", which would be the sd card location. Thanks for the tip!
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Old November 25th, 2012, 06:56 AM   #11 (permalink)
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If you didn't see this, it may help to explain this for some readers:

Quoted from Androidspin.com -

"With Android 4.2, Google introduced multiple users as a new feature. In order to accommodate multiple users, Google is now giving each user a their own folder for storage. If you upgraded to 4.2 from 4.1, then the 4.2 ROM will look for a certain file in /data to determine whether it needs to migrate all of your files to the new multi-user data structure. By default, 4.2 migrates all of /data/media to /data/media/0.

A problem arose though with custom recoveries. A custom recovery retains the /data/media folder during a factory reset. When you factory reset and then boot a 4.2 ROM again, the 4.2 ROM will migrate everything in /data/media again. It will migrate your files every time you factory reset. This multiple migration is what resulted in some people having their files moved to /sdcard/0 or even /sdcard/0/0 etc.

In TWRP 2.3.2.0 we have corrected this problem by ensuring that we do not delete the special file during a factory reset. However, if ended up having your files upgraded you will need to move or merge them back into /sdcard. Also, if you have moved your TWRP folder from /data/media/0 to /data/media so that you could restore backups while using prior TWRP versions, you may now need to move the TWRP folder back into /data/media/0.

As a special note, if you restore a backup to a prior version of Android, you may have to move your files out of /data/media/0 and into /data/media to be able to see them again."

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Old November 26th, 2012, 11:09 PM   #12 (permalink)
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At first I cringed at a multi-user feature at all. Then a co-worker really needed to borrow a phone and it hit me.
With all the personal & private data I have on my phone I get really jumpy when I let someone make a call.
Now I am thinking of a Guest Type account to slap it into so that will allow calls only, no file browsing eh?
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Old December 18th, 2012, 09:05 AM   #13 (permalink)
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I have the same problem. I was using CyanogenMod 10 and I flashed 10.1. Now I have nested directories. (sdcard/0/0)
I can't add a google account on my phone now. Also I can't access those directories with my PC. This is highly annoying. I have bunch of copies of my system and I can't delete them. I backed up before I flashed CM 10.1 but now I can't restore because restore is looking for a different directory.

Is there anybody that can help me with this?
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Old December 18th, 2012, 09:44 AM   #14 (permalink)
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Quote:
Originally Posted by hku987 View Post
I have the same problem. I was using CyanogenMod 10 and I flashed 10.1. Now I have nested directories. (sdcard/0/0)
I can't add a google account on my phone now. Also I can't access those directories with my PC. This is highly annoying. I have bunch of copies of my system and I can't delete them. I backed up before I flashed CM 10.1 but now I can't restore because restore is looking for a different directory.

Is there anybody that can help me with this?
I had the same kind of issue. What I always do is make sure my base ROM.zip is always in my SDcard Root. And the usual SDcard backup on the PC.

I do a FULL wipe including format/system and reflash the base 4.1.x ROM. Go to Gplay and load Root Explorer.

Find the Clockworkmod folders, both of them.
In the 0/ colckworkmod folder I multi-select all the subfolders and files and do a "move" to the other non-0/ clockworkmod folder.
Then I do GPlay and load ROM manager. There I do a restore and my nandroids are there and BAM!

As for moving the CWM sub folders and files, don't do a copy, it takes a while and is prone to corruption being so large, as the move just renames the location and BAM!
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Old December 18th, 2012, 09:59 AM   #15 (permalink)
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Here is the question though. I can't locate any of those subfolders on my PC when the phone is plugged in. I have Galaxy S3 and it doesn't look like a drive. I get into "Internal Storage" and it shows the latest "sccard" version. I can't get into sdcard/0 or sdcard/0/0.

I can see them in my CWM recovery, but I can't see them on the PC.

Messed part is that now google play doesn't work. When I go to Accounts, there is no option for adding google account. lol . this is pissing me off

How do you access to the entire internal storage when plugged in to the PC?
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Old December 18th, 2012, 11:20 AM   #16 (permalink)
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Hm? SIII? This is a Nexus thread. But I have seen this. The onlyway I seen to see them on a PC was to use a Tool Kit to backup the SDcard to the PC and then all are revealed and can be tweaked and then copied back to the phone. But I dunno about a SIII
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Old May 1st, 2013, 12:13 AM   #17 (permalink)
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Quote:
Originally Posted by gapi View Post
I had the same kind of issue. What I always do is make sure my base ROM.zip is always in my SDcard Root. And the usual SDcard backup on the PC.

I do a FULL wipe including format/system and reflash the base 4.1.x ROM. Go to Gplay and load Root Explorer.

Find the Clockworkmod folders, both of them.
In the 0/ colckworkmod folder I multi-select all the subfolders and files and do a "move" to the other non-0/ clockworkmod folder.
Then I do GPlay and load ROM manager. There I do a restore and my nandroids are there and BAM!

As for moving the CWM sub folders and files, don't do a copy, it takes a while and is prone to corruption being so large, as the move just renames the location and BAM!
I put a link to this thread on XDA. Gapi the BAM man has the plan#! Thanks.

http://forum.xda-developers.com/showthread.php?p=40911246#post40911246
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Old May 3rd, 2013, 10:29 AM   #18 (permalink)
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Is there any more info here to be had than the sticky thread here:

http://androidforums.com/verizon-galaxy-nexus-all-things-root/693741-important-please-read-before-you-flash-latest-jelly-bean-roms-edited-3-24-13-a.html

TIA
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Old May 7th, 2013, 04:48 PM   #19 (permalink)
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Maybe this is old news to you guys but 4.2.1 just came out for my device. When I was doing some research on it I found this thread, which was helpful to me. Maybe what I'm working on now won't help you directly but it will help others.

If someone on 4.2 could run this code and post the results, either here or on XDA, that would help me to help others. I'm still on 4.1 and have to near future plans for 4.2 so I can't do it on my device.

Code:
su
cd /
find */0
Thks.
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Old May 12th, 2013, 05:19 PM   #20 (permalink)
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Ok, well I have looked all over my files and everything is still gone, sdcard and sdcard/0 are still empty along with all the emulators and everything, any help on where it could be?
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Old May 12th, 2013, 06:31 PM   #21 (permalink)
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Look in data/media and data/media/0
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Old May 12th, 2013, 07:37 PM   #22 (permalink)
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I couldnt even find folders in data, never mind any files
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Old May 12th, 2013, 11:11 PM   #23 (permalink)
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I couldnt even find folders in data, never mind any files
How did that happen? Are you looking from the device or your PC? What file manager are you using? Have you checked it from the terminal?

Code:
cd /data
ls -al
And post the output
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Old May 15th, 2013, 09:39 PM   #24 (permalink)
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Quote:
Originally Posted by elfaure View Post
How did that happen? Are you looking from the device or your PC? What file manager are you using? Have you checked it from the terminal?

Code:
cd /data
ls -al
And post the output
Well now im back on my nandroid and probably wont try again until the weekend, but i tried three different file managers and couldn't find it. I think im also going to try flashing earlier versions of the aokp mr-1 roms to see if it moves the files automatically, or even try like cm-10.1 and see if that moves them correctly.
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Old May 16th, 2013, 10:16 AM   #25 (permalink)
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Make sure you are using the latest version of your favorite custom recovery before flashing a 4.2.x rom.

good luck
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Old September 4th, 2013, 09:44 AM   #26 (permalink)
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I have a question about this as well. I have a Samsung Galaxy S4 SGH-I337 and a Samsung Galaxy Tab 2 GT-P3113 and both are running Android 4.2.2 and both are showing directories storage/emulated/0, storage/emulated/legacy, storage/sdcard0, storage/extSdCard (which is my 32GB microsdcard) and I need to free up some internal storage space on my tablet. Are all these storage directories necessary? Under the storage settings, it says I have no free internal storage out of my 8GB, but when using ES File Explorer and other File Managers, they all say I have the same amount of free internal storage but they also say my total amount of internal storage capacity is only 4.6GB instead of 8GB. Can I delete the info from one of these 3 directories on my internal storage, like the storage/emulated/0 or the storage/emulated/legacy or the storage/sdcard0? They all seem to have the same information in them. I would really appreciate any help, thanks.
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Old September 5th, 2013, 08:13 AM   #27 (permalink)
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As far as I know those directories are just images of each other, not duplications of the files contained within. Have you gone to /data/media/0 to see what's there?
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Old September 5th, 2013, 09:17 AM   #28 (permalink)
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Apparently, I had an app that created over 1GB of hidden cache files, so I uninstalled the app and both my free space and my total space increased by the same amount. One more thing, I understand that Android 4.2.2 is setup for multiple users, hence the multiple directories, but is it really necessary to have 3 directories that all have the same info? (storage/emulated/0, storage/emulated/legacy, and storage/sdcard0? 8GB of internal memory isn't very much, but I bought this Samsung Galaxy Tab 2 just to mess around with. I also have a Samsung Galaxy Tab 8.9, a Samsung Galaxy S4, and a Samsung Galaxy S3. That's why I bought a 32GB MicroSD card for the Galaxy Tab 2. I thought it was great when the last update came out which allowed me to move apps to the SD card, like I could with earlier versions of Android, but I've found out that not many apps will run from the SD card anymore. It seems like it's only useful to store music, movies, etc. on it.
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Old September 12th, 2013, 09:30 AM   #29 (permalink)
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It is my understanding that the extra directories are not actual copies of all the files, just sy links.
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Old September 18th, 2013, 10:34 AM   #30 (permalink)
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I'm having an issue with all of this too.

Gnex rooted PA 3.99
TWRP

I use goo manager to install the latest twrp and it downloads and I think installs it. Reboot to recovery to see old twrp. Check goo folder and nothing there. Check back up folder in twrp and it's a different nandroid then the ones I can find in Root Explorer.

Using Root Explorer i can see the lastest downloaded twrp in the goo folder but I cannot find the nandriod that I see in twrp.

data/media/0 - sdcard/- storage/emulated, sdcard 0 all have the same info as I can tell.

Is there anywhere else that I'm missing?

Thanks
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