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[Solved] SD Card Wont Mount on Android & PC

Updated on Dec 10, 2018 by Jean to Partition Manager

What's mount and unmount of an SD card? What should you do if your micro SD card failed to mount on an Android phone, camera or other digital devices? This page will explain in details about SD card mount and unmount, additionally offers the two most applied methods to fix micro SD card won't mount problem on either a Windows PC or an Android smartphone.

The phone won't mount the SD card:

"My LG phone is not mounting my SD card. I've tried everything I can to fix it, but the attempt is in vain. If reboot the phone and keep ejecting and then inserting the SD card into the phone don't help, what should I do to make the phone mount SD card properly?"

What does it mean when your SD card is mounted or unmounted

In case you get confused when receiving an error that says the SD card won't mount on a phone, camera or other digital devices which use an external memory card, there is a brief introduction of 'mounted' and 'unmounted'.

  • Mounted: the card is integrated with your computer, phone or whatever and ready to use.
  • Unmounted: the card isn't integrated and can safely be removed, without causing damage.

How to Fix an SD Card Won't Mount Error

As you can tell, to make a phone or a specific device to read and write data on a memory card, it has to be mounted. Typically, when you insert a card, most devices will automatically mount it. However, sometimes it may fail, so you have to choose to mount the SD card or fix the SD card manually won't mount error with other solutions.

Here, we selected the two most applied and useful methods to fix SD card won't mount problem. Please go on to learn the details.

Solution 1: Fix SD card won't mount on an Android smartphone

Prepare your micro SD card that has the mounting problem as well as an Android phone. Let's start.

Step 1: Power off your Android smartphone. Now insert the SD card into the SD card slot on the device.

Step 2: Power on the device.

Step 3: Tapping on "Settings" from the main menu and then click "SD and Phone Storage".

Step 4: Click on "Reformat". After a few seconds, the format process should accomplish. If it takes a longer time than expected, it's better to restart the phone once.

Step 5: On the same screen where you format SD card, tap on "Mount SD Card". There is a chance that the "Mount SD Card" option is unavailable, just select "Unmount SD Card" first. Wait for the card to unmount, and then tap on "Mount SD Card" again.

choose to unmount sd card and then mount sd card

Solution 2: Fix SD card won't mount on a Windows PC

In most cases when an SD card is unable to be mounted on the phone, besides the poor connection and some Android software issues, it's probably that the SD card is corrupted. And, the other way to solve the mount failure problem of a micro SD card is using a third-party free partition software. It's more advanced and efficient, however, with a little risk.

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 Windows 10 is supported

Why is that? We're going to use the recommended micro SD card repair tool to format the corrupted SD card that won't mount. Formatting will erase everything on the card, so make sure you had saved a copy of the SD card contents.


Step 1: Open EaseUS Partition Master. Find your SD card and right-click the partition you want to format and choose "Format".

Format Hard Drive Partition - Step 1

Step 2: Set a new partition label, file system (NTFS/FAT32/EXT2/EXT3), and cluster size to the selected partition, then click "OK".

Format Hard Drive Partition - Step 2

Step 3: Click "OK" on the pop-up window to continue.

Format Hard Drive Partition - Step 3

Step 4: Click the "Execute Operation" button on the toolbar, then click "Apply" to start formatting your SD card.

Format Hard Drive Partition - Step 4

After formatting the memory card, now you can put it back to the Android phone. Now the SD card should be mounted by the phone automatically. If not, repeat the first method to mount it manually.