Samsung all E: Can't mount /sdcard/" Issue on Android Devices

Here’s an example screenshot of the issue:

Fixing “E: Can’t mount /sdcard/” Issue

Method 1: Format SD Card to a Different File System

Actually, the “E: Can’t mount /sdcard/” issue is closely related to the file system type of your SD card and the inability of the device recovery system to read a particular file system.

1. Pull out your phone’s SD card.
2. Put in a memory card reader and plug it into the computer.
3. Create a backup of the contents of the memory card on your computer.
4. Now open My Computer and right-click the drive that shows represents your memory card.
5. Select Format… option.
6. Click File system and select NTFS or exFAT or FAT32.
7. Then click Start button.
8. Now copy the backed up files back to the SD card.
9. Insert the card into the device, boot into recovery to check if the problem is fixed.

In case the SD card issue mount issue is not fixed, try formatting the memory card again with a different file system (those you did not try yet). If formatting the card using the NTFS or exFAT or FAT32 file systems does not work for you, try SD Formatter tool (it really works, guys!).
Download SD Formatter

Method 2: Update CWM or TWRP Recovery

Formatting the SD card did not help you at all? Don’t worry, this might be a recovery related issue! Just download the latest version of CWM/TWRP recovery and flash it. You can also try switching to a different recovery than the one installed on your device. In other words, if your device has CWM, try TWRP and vice versa.
Download ClockworkMod Recovery
Download TWRP Recovery

Flashing ROMs When SD Card is Not Mounted

If you got an urgent need to flash a ROM but after booting into CWM or PhilZ or TWRP recovery, you are not able to access the external SD storage because of E: Can’t mount /sdcard/ issue, there is still a way you can install the ROM using ADB commands. Here’s how:

1. Set up Android SDK (ADB and Fastboot) on your computer. Alternatively, you can download the minimal Fastboot tool and unzip it.
2. Now copy the ROM zip file to the platform-tools or mfastboot-v2 folder.
3. Get into CWM recovery mode.
4. Make sure that USB Debugging is enabled on your phone. Just to make sure that you device is detected by ADB, connect you phone to computer, launch a command window from the ADB and fastboot folder and type the following command:

   adb devices

5. If you see your device’s serial number in the command window, you are good to go.
6. Now type this:

   adb shell

7. You should see “#” (hash) somewhere in front of your command line.
8. Now type the following command and press Enter key:

   ls

9. Now you should show you the folders on your device. Try to navigate to the directory /data/media using the following command:

   cd /data/media/

10. Now push the ROM file to the above directory via the following command (replace ROM.zip with the name of your ROM file):

    adb push ROM.zip /data/media/ROM.zip

The ROM file will now be installed to your phone and it should boot properly. This tip can be helpful if your device gets into a boot loop and you are not able to access your ROM backup or flashable Zip on the SD card.

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