[APP][v1.8 (+US)] SGS3 Easy UMS - Mount external microSD card as USB mass storage

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gumpelstilzchen

Senior Member
Mar 28, 2010
81
384
83
This app will make the external (not the internal!) microSD card of your Samsung Galaxy S3 (International, US versions, International LTE) available as USB mass storage device.

Also reported working on Galaxy Note 2, see compability list below.

Most important commands in this app:
http://forum.xda-developers.com/showpost.php?p=27282116&postcount=58
http://forum.xda-developers.com/showpost.php?p=28151372&postcount=133
http://forum.xda-developers.com/showpost.php?p=28670285&postcount=1

Thanks d4fseeker :good:

:angel: If you like the app, please consider donating by buying this app or via PayPal (see link on the left, below username etc.) :good: Some people gave 1 star reviews to the app although I think I'm extremely clear with stating that this is only a donation app - but I can't change that :(


Compability
Code:
MODEL / ROM / KERNEL / APP VERSION / CONFIRMED BY

WORKING:
GT-I9305 (LTE) / ? / ? / 1.8 / Jarmezrocks
SGH-I317 (AT&T Note 2) / I317UCALJ2 / ? / 1.8 / dabuck
GT-N7100 (Intl Note 2) / ? / ? / 1.8 / geovass
GT-I9300 (International) / Stock (LFB) / Stock / 1.5 beta / woaloo
GT-I9300 (International) / CM10 / ? / 1.5beta / lubluchka
SGH-I535 (VZW) / ? / ? / 1.4beta / open1your1eyes0
SGH-T999 (T-Mobile US) / ? / ? / 1.4beta / gr4p3s
?

NOT WORKING:
?
I can only test it on my own GT-I9300; please report back your success with the information needed in the table above.

If you have a custom kernel, you have to make sure there is one of the three possible lun files available (see Problems section).

Regarding US versions: Starting with 1.4beta, it also works with US versions (see here). This may not be the case for all variants, so please report back with the information needed in the compability table.


Problems? Not working?
Report the exact problem, model/ROM/kernel/etc., the exact error message and the results of the following commands (use Terminal Emulator or something similar):
Code:
mount

ls /sys/devices/platform/s3c-usbgadget/gadget/lun0/file
ls /sys/devices/virtual/android_usb/android0/f_mass_storage/lun_ex/file
ls /sys/devices/virtual/android_usb/android0/f_mass_storage/lun/file

mount | sed 's/ on / /g' | grep extSdCard | cut -f 1 -d ' '
Note: Only ONE of the three ls commands must be successful (file exists)

You may need to replace "extSdCard" in the last command with the mount point name of your external sd card (e.g. external_sd or sdcard1 for CM10)

If the last command does fail, there is probably something wrong with your BusyBox installation. You should reinstall it - I recommend this app.

On some Win7 PCs, these steps may be needed:
Now follow these steps:

1. On your Windows 7 computer you will see it will try to install “SAMSUNG Mobile MTP Device” as one of the drivers and fail *this is normal*
2. Go into Device Manager on your computer, right click “SAMSUNG Mobile MTP Device” and select “Properties”
3. Click on the “Driver” tab and click the “Update Driver” button, a prompt will then come up
4. Select “Browse my computer for driver software”, then select “Let me pick from a list of device drivers on my computer” on the next screen
5. Select “USB Mass Storage Device” as the new driver from that list and finish up that install
6. At the end you will see something like this on your computer – Screenshot Here
7. Windows will install final drivers automatically and a new “Disk drive” will show up on your computer, this is your external SD card on your device

Keep in mind that it is not possible to get access to the internal storage as USB mass storage device.


Get the "extSdCard is being accessed by [...]" message? Wait until the app accessing the sd card has finished, stop it yourself or reboot.

Changelog
Code:
1.8
- added support for third lun file, should work with GT-I9305 (Intl LTE version) now

1.7
- fixed recognition failure if "mount" output contained "on" as the second column (e.g. Siyah kernels)

1.6
- fixed code so that it (hopefully!) works with recent CM10 versions again
- made some error messages clearer
- drop of "beta" name doesn't actually mean much by the way, but I think it looks a bit cleaner this way and does not make a difference

1.5beta
- added support for CM10 sd card paths (/mnt/external_sd and /mnt/sdcard1)

1.4beta
- added alternative method for users without s3c-usbgadget (may work on US versions)

v1.3beta
- rewrote the whole logic
- now opens Play Store entry of BusyBox if it is not yet installed
- notifies user if device seems to lack s3c-usbgadget module
- notifies user which apps are accessing the extSdCard
- generally better and more precise error messages

v1.2beta2
- added info about busybox requirement (maybe this will be removed later)
- added link to donation app

v1.2beta
- Automatically tries to unmount extSdCard before starting UMS mode. This will fail if some app is accessing it, so just wait or cancel that app if you know it and try again - possibly several times. This prevents the potential data loss with previous versions.
- It now checks the location of the extSdCard device. This should help with compabilty, e.g. for US versions.
- Added some log output and toasts (2s delay)
- Added link to this thread and version number in app
- It's a beta so please beware, but I think the worst probable thing that can happen is that it does not work (e.g. it does not start UMS if it cannot unmount the extSdCard).
- Dammit, the whole day is already over

v1.1
- Added option for going back to MTP

v1.0
- Initial release


Screenshot_2012-07-05-17-00-18.png



Download
v1.8: http://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.8.apk

v1.7: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.7.apk

v1.6: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.6.apk

v1.5beta: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.5beta.apk

v1.4beta: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.4beta.apk

v1.3beta: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.3beta.apk

v1.2beta2:
https://dl.dropbox.com/u/22760184/android/SGS3_Easy_UMS_v1.2beta2.apk

v1.2beta: https://dl.dropbox.com/u/22760184/android/SGS3_Easy_UMS_v1.2beta.apk

v1.1: http://dl.dropbox.com/u/22760184/SGS3_Easy_UMS_v1.1.apk

v1.0: http://dl.dropbox.com/u/22760184/SGS3 Easy UMS.apk
(also, it's attached)

Credits: d4fseeker, Sakaschi, bazald, dAKirby309 (icon), RootTools devs

Code:
Uses RootTools project, which is made available by Stephen Erickson,
Chris Ravenscroft, Dominik Schuermann, Adam Shanks under Apache
License Version 2: http://www.apache.org/licenses/LICENSE-2.0
 

Attachments

  • SGS3_Easy_UMS_v1.1.apk
    9.1 KB · Views: 19,160
  • SGS3_Easy_UMS_v1.2beta.apk
    11.9 KB · Views: 1,775
  • SGS3_Easy_UMS_v1.2beta2.apk
    12 KB · Views: 3,093
  • SGS3-Easy-UMS-v1.3beta.apk
    62.5 KB · Views: 2,022
  • SGS3-Easy-UMS-v1.4beta.apk
    62.9 KB · Views: 1,842
  • SGS3-Easy-UMS-v1.5beta.apk
    63.1 KB · Views: 4,014
  • SGS3-Easy-UMS-v1.6.apk
    63.3 KB · Views: 1,661
  • SGS3-Easy-UMS-v1.7.apk
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  • SGS3-Easy-UMS-v1.8.apk
    63.5 KB · Views: 26,157
Last edited:

kultus

Senior Member
Jul 7, 2007
732
39
0
unbelievable!!! It works...is it possible to see also internal storage as well? In explorer I get 2 new devices one is SD card and the second I cant access...
 

BoneMo

Senior Member
Jun 25, 2009
2,018
290
0
Prague
not working at all

i just see 2 empty drives.
tried on Windows 8 Consumer Preview with Kies
and on Windows 7 Professional without Kies but...still 2 empty removable drives...
even tried a phone reboot...:(

PS: Should I install some PC drivers ?
 
Last edited:

gumpelstilzchen

Senior Member
Mar 28, 2010
81
384
83
unbelievable!!! It works...is it possible to see also internal storage as well? In explorer I get 2 new devices one is SD card and the second I cant access...

Sorry, at least currently that's not possible. I don't know if that will change.





i just see 2 empty drives.
tried on Windows 8 Consumer Preview with Kies
and on Windows 7 Professional without Kies but...still 2 empty removable drives...
even tried a phone reboot...:(

PS: Should I install some PC drivers ?

On of the drives is your external card. That's the only one that can be accessed. Theoretically it should be automatically mounted by windows, somehow this does not seem to work for you... I think you should not need additional drivers, but I'm also not sure what the root of the problem is.

Sent from my GT-I9300 using XDA
 

BoneMo

Senior Member
Jun 25, 2009
2,018
290
0
Prague
On of the drives is your external card. That's the only one that can be accessed. Theoretically it should be automatically mounted by windows, somehow this does not seem to work for you... I think you should not need additional drivers, but I'm also not sure what the root of the problem is.

Sent from my GT-I9300 using XDA

it is strange when it does not work for 2 computers
also tried to write the command from http://forum.xda-developers.com/showpost.php?p=27282116&postcount=58 into shell but also not working

do not know....so because i have both removable drives empty...i will use my DropBox + DropSync, FTP and unmount sdcard put it into card reader and then after copying from PC i will mount it back to phone

PS: i am just sad ,,because it was a great hope for mass storage mode
 
Last edited:

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  • 355
    This app will make the external (not the internal!) microSD card of your Samsung Galaxy S3 (International, US versions, International LTE) available as USB mass storage device.

    Also reported working on Galaxy Note 2, see compability list below.

    Most important commands in this app:
    http://forum.xda-developers.com/showpost.php?p=27282116&postcount=58
    http://forum.xda-developers.com/showpost.php?p=28151372&postcount=133
    http://forum.xda-developers.com/showpost.php?p=28670285&postcount=1

    Thanks d4fseeker :good:

    :angel: If you like the app, please consider donating by buying this app or via PayPal (see link on the left, below username etc.) :good: Some people gave 1 star reviews to the app although I think I'm extremely clear with stating that this is only a donation app - but I can't change that :(


    Compability
    Code:
    MODEL / ROM / KERNEL / APP VERSION / CONFIRMED BY
    
    WORKING:
    GT-I9305 (LTE) / ? / ? / 1.8 / Jarmezrocks
    SGH-I317 (AT&T Note 2) / I317UCALJ2 / ? / 1.8 / dabuck
    GT-N7100 (Intl Note 2) / ? / ? / 1.8 / geovass
    GT-I9300 (International) / Stock (LFB) / Stock / 1.5 beta / woaloo
    GT-I9300 (International) / CM10 / ? / 1.5beta / lubluchka
    SGH-I535 (VZW) / ? / ? / 1.4beta / open1your1eyes0
    SGH-T999 (T-Mobile US) / ? / ? / 1.4beta / gr4p3s
    ?
    
    NOT WORKING:
    ?
    I can only test it on my own GT-I9300; please report back your success with the information needed in the table above.

    If you have a custom kernel, you have to make sure there is one of the three possible lun files available (see Problems section).

    Regarding US versions: Starting with 1.4beta, it also works with US versions (see here). This may not be the case for all variants, so please report back with the information needed in the compability table.


    Problems? Not working?
    Report the exact problem, model/ROM/kernel/etc., the exact error message and the results of the following commands (use Terminal Emulator or something similar):
    Code:
    mount
    
    ls /sys/devices/platform/s3c-usbgadget/gadget/lun0/file
    ls /sys/devices/virtual/android_usb/android0/f_mass_storage/lun_ex/file
    ls /sys/devices/virtual/android_usb/android0/f_mass_storage/lun/file
    
    mount | sed 's/ on / /g' | grep extSdCard | cut -f 1 -d ' '
    Note: Only ONE of the three ls commands must be successful (file exists)

    You may need to replace "extSdCard" in the last command with the mount point name of your external sd card (e.g. external_sd or sdcard1 for CM10)

    If the last command does fail, there is probably something wrong with your BusyBox installation. You should reinstall it - I recommend this app.

    On some Win7 PCs, these steps may be needed:
    Now follow these steps:

    1. On your Windows 7 computer you will see it will try to install “SAMSUNG Mobile MTP Device” as one of the drivers and fail *this is normal*
    2. Go into Device Manager on your computer, right click “SAMSUNG Mobile MTP Device” and select “Properties”
    3. Click on the “Driver” tab and click the “Update Driver” button, a prompt will then come up
    4. Select “Browse my computer for driver software”, then select “Let me pick from a list of device drivers on my computer” on the next screen
    5. Select “USB Mass Storage Device” as the new driver from that list and finish up that install
    6. At the end you will see something like this on your computer – Screenshot Here
    7. Windows will install final drivers automatically and a new “Disk drive” will show up on your computer, this is your external SD card on your device

    Keep in mind that it is not possible to get access to the internal storage as USB mass storage device.


    Get the "extSdCard is being accessed by [...]" message? Wait until the app accessing the sd card has finished, stop it yourself or reboot.

    Changelog
    Code:
    1.8
    - added support for third lun file, should work with GT-I9305 (Intl LTE version) now
    
    1.7
    - fixed recognition failure if "mount" output contained "on" as the second column (e.g. Siyah kernels)
    
    1.6
    - fixed code so that it (hopefully!) works with recent CM10 versions again
    - made some error messages clearer
    - drop of "beta" name doesn't actually mean much by the way, but I think it looks a bit cleaner this way and does not make a difference
    
    1.5beta
    - added support for CM10 sd card paths (/mnt/external_sd and /mnt/sdcard1)
    
    1.4beta
    - added alternative method for users without s3c-usbgadget (may work on US versions)
    
    v1.3beta
    - rewrote the whole logic
    - now opens Play Store entry of BusyBox if it is not yet installed
    - notifies user if device seems to lack s3c-usbgadget module
    - notifies user which apps are accessing the extSdCard
    - generally better and more precise error messages
    
    v1.2beta2
    - added info about busybox requirement (maybe this will be removed later)
    - added link to donation app
    
    v1.2beta
    - Automatically tries to unmount extSdCard before starting UMS mode. This will fail if some app is accessing it, so just wait or cancel that app if you know it and try again - possibly several times. This prevents the potential data loss with previous versions.
    - It now checks the location of the extSdCard device. This should help with compabilty, e.g. for US versions.
    - Added some log output and toasts (2s delay)
    - Added link to this thread and version number in app
    - It's a beta so please beware, but I think the worst probable thing that can happen is that it does not work (e.g. it does not start UMS if it cannot unmount the extSdCard).
    - Dammit, the whole day is already over
    
    v1.1
    - Added option for going back to MTP
    
    v1.0
    - Initial release


    Screenshot_2012-07-05-17-00-18.png



    Download
    v1.8: http://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.8.apk

    v1.7: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.7.apk

    v1.6: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.6.apk

    v1.5beta: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.5beta.apk

    v1.4beta: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.4beta.apk

    v1.3beta: https://dl.dropbox.com/u/22760184/android/sgs3-easy-ums/SGS3-Easy-UMS-v1.3beta.apk

    v1.2beta2:
    https://dl.dropbox.com/u/22760184/android/SGS3_Easy_UMS_v1.2beta2.apk

    v1.2beta: https://dl.dropbox.com/u/22760184/android/SGS3_Easy_UMS_v1.2beta.apk

    v1.1: http://dl.dropbox.com/u/22760184/SGS3_Easy_UMS_v1.1.apk

    v1.0: http://dl.dropbox.com/u/22760184/SGS3 Easy UMS.apk
    (also, it's attached)

    Credits: d4fseeker, Sakaschi, bazald, dAKirby309 (icon), RootTools devs

    Code:
    Uses RootTools project, which is made available by Stephen Erickson,
    Chris Ravenscroft, Dominik Schuermann, Adam Shanks under Apache
    License Version 2: http://www.apache.org/licenses/LICENSE-2.0
    8
    It is not working on s4 revolution 8.0 Rom based on stock 4.3
    4
    Just tried mounting in UMS mode and get error:

    Could not get path of external sd card (extSdCard/external_sd/sdcard1). Maybe it's unmounted?

    Rebooted and got the same error...

    This didn't happen with v43.2 and stock kernel. Any ideas?

    Ok. Tried the usb debug switch. Didn't change anything. De-installed Easy UMS. Installed SG USB Mass Storage Enabler. All working correctly!

    Sorted. Thanks.
    4
    I am currently working on a Tasker-based replacement for this app. It does the same thing, but only automatically when you plug in the phone into a PC. It's under testing right now. I will post it in a new thread and let you guys know about it for further testing when I'm done. It will allow you to customzie the mount point and will be more easily adapted to other ROMs.
    3
    It should work with CM10 now :fingers-crossed:

    Regards
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