How does SDCard work? - Galaxy S III Q&A, Help & Troubleshooting

Waiting for my AT&T model and had a question, how does the 16GB internal storage get presented at file system level? Is it mounted as /sdcard or something else? If so what does the external SD get mounted as? Trying to decide if I need an SDcard or not. 16GB is enough for me but concerned about app compatibility depending on how its setup.
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Mounts as sdcard external card mounts as ext sdcard on stock firmware apps cannot be installed to ext sdcard.
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[Q] is there a way to unmount internal storage?

Is there a way to unmount the internal SD card so I can only use the external SD card? I'm trying to sync tracks via Spotify but the internal storage on my device isn't enough. I'm rooted and running stock Gingerbread. TIA
I want to know this too...
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Unless you are using CM7 which allows you to change which card is mounted as /sdcard and /mnt/emmc I don't know of any way to do it.
You can go to settings>storage settings>unmount sdcard but I don't think it is going to do what you want.
Speedily sent from CM7 Beta

Easy one. Where is my internal storage on CM9?

On all other roms I used it stored my internal SD card in the 'mnt/sdcard' and the external would be in the 'mnt/sdcard/external_sd'...
This ROM stores the external sdcard in the opposite manner (mnt/sdcard) which makes more sense but I can't find out where the internal sdcard is stored.
Thanks in advance.
ROM is seraphim mesosphere...or something like that lol
/emmc
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Read this
http://yagyagaire.blogspot.com/2012/05/moving-apps-to-sd-ext-in-android-40-os.html#.T-Xe_RfUN-Y

[Q] How to swap internal & external storage?

Does anyone know how to swap the internal storage with the sd card? The fstab looks funky.
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Mister_Mxyzptlk said:
Does anyone know how to swap the internal storage with the sd card? The fstab looks funky.
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what do you mean by swap the internal storage with the external? dont you just normally use both internal and external together?
FOr what reasons? For apps to be moved/installed in the external SD?
Answer is at the moment Apps2SD doesn't work YET in s3
No. I mean to literally swap their mount directories. I've done this before on my Note. I edited my vold.fstab and with a little help got my internal storage mounted to /sdcard/ExternalSD and my 64GB SD card mounted to /sdcard. That's what I want to do here.
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Anyone?
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For what reasons do you want to do this?
Look in siyah kernel thread.he changed the vold.fstab mounted in adb.ask him about the swap.
zodiaxe66 said:
Look in siyah kernel thread.he changed the vold.fstab mounted in adb.ask him about the swap.
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Thank you so much. And to answer the questions, I want to do this so my internal storage can be as big as the SD card I'm using. For example, I have the storage swapped on my n7000 so my 64GB SD card is read as internal storage and my 16GB internal storage is read as an external SD card.
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bordikun said:
For what reasons do you want to do this?
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I would like to do the same. i have done this switch on my note and it works flawlessly. I want to do this because I am a hardcore gamer and 16gb is nowhere near enough space to store all my game data, but my 64gb sd card is.
Mister_Mxyzptlk said:
Thank you so much. And to answer the questions, I want to do this so my internal storage can be as big as the SD card I'm using. For example, I have the storage swapped on my n7000 so my 64GB SD card is read as internal storage and my 16GB internal storage is read as an external SD card.
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Never thought of it that way hehe. But I have a question about the setup: Have you ever had issues where your SD card randomly unmounted itself? If so, what happened to the system? Were you still able to run it or did it freeze or anything else?
Thanks
Not even once and I have had it set this way on my note for months through several different roms
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The internal SDcard is not a real partition but a userspace mount (fuser)
It's configured in the file /init.smdk4x12.rc with the exact definition:
Code:
service sdcard /system/bin/sdcard /data/media 1023 1023
I don't see the daemon getting any kind of configuration as to the target directory. Either it's hardcoded or it uses /system/etc/vold.conf definition volume_sdcard the mount_point value.
You can't use Easy UMS anymore though since it will unmount the external SD.
Just using the APK Directory Bind will work fine though to simulate folders on the external SDcard as being on the internal one.
You can swap over the Internal SD with your external SD so you could have a 64GB phone with a 16GB ext card (assuming your phone is a 16GB one) - take a look at ExtSd2InternalSd v4|Increase your data storage

Is Formatting the External SdCard OK?

I recently upgraded from the Sensation 4g. I had a lot of files on the SdCard when i put it into my shiny new GS3 Tmo. Does the recovery flash to the externel or internel sd card? and if internel, can i format the SdCard with no issues? Thank you.
Its on the internal memory
I believe that the internal SD card is partitioned so its fine to format both
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[Q] Rezound file structure

I have explored the phone using ES File Explorer. But, I just can't seem to grasp the file structure.
There is an sdcard folder, sn SDcard0 and sdcard1. Some folders and their contents appear to be mirrored in other places. There are several sdcard folders, in various other places. Just confusing as heck to me.
Can someone please explain the file structure to me. What is the external card. What is the internal card? Why is there are internal card? Why are there multiples of the same folder. What does mnt mean?
Thanks for the help.
This won't answer much but sdcard is the removable one and emmc is the internal storage. Idk why its there's short cuts everywhere, maybe its just faster access but it doesn't take up space
Are you trying to do something specific?
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wiredwrx said:
I have explored the phone using ES File Explorer. But, I just can't seem to grasp the file structure.
There is an sdcard folder, sn SDcard0 and sdcard1. Some folders and their contents appear to be mirrored in other places. There are several sdcard folders, in various other places. Just confusing as heck to me.
Can someone please explain the file structure to me. What is the external card. What is the internal card? Why is there are internal card? Why are there multiples of the same folder. What does mnt mean?
Thanks for the help.
Click to expand...
Click to collapse
The external card is the Micro SD card you see when you take the back cover of your phone off.
The internal card is the 16 gb of internal storage that is part of the motherboard.
The internal card gives you more storage and is also where some system files are.
Multiples of the same folder? I dunno.
mnt is usually the "mount" folder in a linux OS (which Android is) and where drives and storage is mounted.
GrayTheWolf said:
The external card is the Micro SD card you see when you take the back cover of your phone off.
The internal card is the 16 gb of internal storage that is part of the motherboard.
The internal card gives you more storage and is also where some system files are.
Multiples of the same folder? I dunno.
mnt is usually the "mount" folder in a linux OS (which Android is) and where drives and storage is mounted.
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actually the Removable sd card is the 16Gb one. not the internal
bunchies said:
actually the Removable sd card is the 16Gb one not the internal
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The internal is 16gb and the phone comes with a 16gb for the external as well - it's partitioned though, so there's the "internal" and "phone" for the internal 16gb card, then "storage card" for the external if you look under storage in settings. My removable external is a 64gb. :highfive:
Hmmm, I haven't upgraded mine yet but I only have 600mb left total Lol
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bunchies said:
actually the Removable sd card is the 16Gb one. not the internal
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The Rezound has 16 GB of internal memory and comes with a 16 GB micro SD card.
GrayTheWolf said:
The Rezound has 16 GB of internal memory and comes with a 16 GB micro SD card.
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I just found that out
I assumed because my micro SD said 16Gb and internal was partitioned at 10gb than I tested by taking out the micro SD card and than booting into twrp and used the file manager to see if sdcard was gone and it was but emmc was still present
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bunchies said:
I just found that out
I assumed because my micro SD said 16Gb and internal was partitioned at 10gb than I tested by taking out the micro SD card and than booting into twrp and used the file manager to see if sdcard was gone and it was but emmc was still present
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bunchies said:
Hmmm, I haven't upgraded mine yet but I only have 600mb left total Lol
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Well you can get a 64gb card for $100 less than I got mine for, well actually, for $55 more since mine was a xmas gift.
Seriously, you can get a 64gb card for less than $60 on amazon.
Sweet, I'll make sure to buy one to store more music and adventure time on since I have a road trip in about a month and a half
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