The instructions below will help you fix the problems that your Galaxy S10 is experiencing with external microSD cards not getting detected. Check all the methods below before deciding to factory reset your phone.

If you're trying to add an external microSD card to your device and it doesn't get recognized, then you might also take into consideration that your Galaxy S10 unit might be faulty and you should think about returning it.

How to Fix the "External SD card not detected" bug on Samsung Galaxy S10

If you don't want to return your device and you want to repair it by yourself, then you should check the info below, as you might find a one that is capable of fixing your device.

Make sure the SD card is working and not faulty

All the microSD cards you're buying for a smartphone will come with a small adapter that you can use in order to connect it with a computer. Put the microSD in its adapter and connect it to your computer's SD card reader, if it has one.

If you don't own a PC or a laptop with such function, then you should ask one of your friends to help you. If the microSD card is detected and works as it should when connected to a PC, then something is wrong with your phone and you need to continue with the next methods below.

Unmount and remove SD card

Another thing that you can try is to unmount the SD card, remove it and then add it back into your Galaxy S10 to verify that it works.

Go to Settings, open Device Care, then tap on Storage and open the 3dot menu to select "Storage Settings". Tap on the SD card text and at the bottom of the next menu you will see the "unmount" option. Tap Unmount and confirm.

Next, disconnect the SD card from your Galaxy S10 by removing the phone's SD card tray. Now you should power off the phone and re-add the micro SD in order to test it if it works.

Format the SD card using your computer

Connect your microSD to your computer and format it. Right click its icon when it is detected by the computer and select the 'format' option from the list. After you are done you need to connect your microSD card to your smartphone and test it.

Format SD card using your Galaxy S10:

You can also choose to format your microSD card using the device's Storage options. Connect the SD card to your phone and then open the Settings menu.

Go to Device Care menu, tap on Storage, then tap the 3dot icon and select Storage Settings. Now you have to tap on the SD Card text. In order to delete teh data from the microSD and reformat it tap the "format" option and confirm the process.

When the SD card is reformatted you can test it in order to see if it now work with your Galaxy S10. If the Galaxy S10 is not able to detect the micro SD, then you should attempt to format it using another smartphone.

Reset Galaxy S10 app preferences

By resetting the app preferences of your Galaxy S10 you will force the device to register once again the settings for each application, as there might be an app that interferes with the way the Galaxy S10 interacts with a micro SD.

Here's how to do it: go to Settings, open Apps and use the "more settings" option from the 3dots icon. Now you have to select 'reset app preferences' option and confirm the process. Reboot your Galaxy S10 in normal mode and verify the micro SD after the device boots back on again.

Reset all Galaxy S10 settings

You can also choose to reset all the Samsung Galaxy S10 settings without losing any data files in the process. This can be done by going to Settings and opening the General Management menu. Now you have to open the Reset menu and then use the "Reset Settings" option.

Confirm this process and all the Galaxy S10 settings you've modified since you bought the device will be restored to their default state.

Boot Galaxy S10 in Safe Mode

You can try to boot your Galaxy S10 in Safe Mode and check to see if the microSD card works. If the SD card works in Safe Mode, then you might want to start removing from the apps that you've installed recently, as one of the newest apps might be interfering with the microSD detection.

Here's how to boot the Galaxy S10 in Safe Mode: press the Power button, and then tap and hold the "power off" option until its icon is replaced by "safe mode" option. Tap the "Safe Mode" icon and wait for the phone to complete boot.

Install all the latest Firmware Updates for Galaxy S10

You need to make sure that your phone runs the latest possible Android firmware build. Go to Settings> Software Update and search for update files. If a new firmware is ready for download you simply need to confirm the process and your Galaxy S10 will complete the installation automatically.

Wipe Samsung Galaxy S10 Cache Partition using Recovery Mode

The Samsung Galaxy S10 cache partition can be wiped using the Recovery Mode options. Here's how to do it:

  • power off the phone.
  • press and hold Volume Up + Bixby + Power options.
  • release the buttons when a blue screen with an Android logo loads.
  • wait 30 seconds for the Recovery Mode to complete the boot.
  • select 'wipe cache partition' and confirm the process.
  • confirm the process and reboot the phone in normal mode.

Factory Reset the Galaxy S10 internal storage from Recovery Mode

The last thing that you can try is to factory reset the Samsung Galaxy S10 and that will restore the phone to its original state, and in case the micro SD card still doesn't work with it, then you can send it to a repair shop.

  1. Power off the Galaxy S10.
  2. Boot it in Recovery Mode by pressing and holding Volume Up + Bixby + Power buttons.
  3. Release the buttons when the screen turns blue and wait for the Recovery Mode to load.
  4. Select 'wipe data/ factory reset' option and confirm the process.
  5. Now you can reboot the phone in normal mode and you're done.

These were all the steps that you had to take in order to try and fix the micro SD detection problems with your Galaxy S10. If you need any extra help with your Galaxy S10, then you should tell us in comments below. Make sure to list as many details as possible related to the problems your Galaxy S10 is experiencing, so that we will be able to easily come up with a solution that fixes the micro SD card.

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