How To Fix Unreadable SD Card In Windows

By nagib

PUBLISHED 8:29 pm GMT+0700 Tue May 2021

SD Card is a kind of removable storage device and SD cards are widely used in various electronic devices such as Android smartphones, tablets or cameras etc.

Sometimes, you want to connect an SD Card to a Windows 7/8/10 computer to transfer some files.

But when you double-click Computer or This PC, you find that your SD Card is not displayed in Windows File Explorer so you cannot transfer files using the SD Card.

Common reasons for unreadable SD Card / SD Card not detected

Unreadable SD Card problems are quite often experienced by a number of Windows computer users. Take a look at the following reasons which might be the cause of this problem.

  • Bad contact between SD card and computer.
  • Your SD card drive letter is missing.
  • SD card file system not recognized or corrupted.
  • The device drive is outdated.
  • The SD card is infected with a virus.

Specific & effective solution to solve unreadable SD card in Windows PC

SD Card not showing up in Windows 7/8/10 can happen for various reasons, so we have put together a number of solutions which we think are appropriate presented in the following context, based on the most likely reasons.

1. Check if the SD Card is connected to your computer properly?

The connection between the SD Card and the computer is linked to the USB port, SD Card reader, and SD Card itself.

If the SD Card is covered in dust, the SD Card reader is not properly inserted into the computer or the USB port is not working, then your SD Card will not appear on the computer.

Thus, keeping your SD Card clean, change the USB port and properly insert the SD card into the computer to see if the SD Card can be displayed in File Explorer.

2. Assign a drive letter on the SD Card via Disk Management

If your SD Card is connected to your computer properly but doesn’t appear in File Explorer, then you can open Disk Management to see if the drive letter is missing.

If it is, you can assign a drive letter to it by performing the following steps:

  1. Press “Windows” + “R” simultaneously to open the Run dialog.
  2. Enter “diskmgmt.msc” and press “Enter” key to open Disk Management.
Diskmgmt msc
  1. Find the SD Card that doesn’t appear in Windows File Explorer, right-click the partition above it and select “Change Drive Letter and Path …”
Disk Management
  1. In the pop-up window, click “Add” to assign a drive letter to your SD Card.
Add Disk Management Letter

Then, you can exit Disk Management and go to File Explorer to use the SD Card.

3. Format the SD Card to a recognized file system

If your SD Card file system is corrupted or unreadable, then it won’t appear properly in File Explorer even after the drive letter has been assigned and you won’t be able to open the SD Card.

In such circumstances, you can choose to format it with a Windows compatible file system.

For this matter, I recommend the AOMEI Partition Assistant software. It is applicable to Windows 10/8/7, XP and Vista operating systems and allows you to format SD Cards, USB flash drives and hard drives to file system formats that Windows recognize such as file systems:

  • exFAT.
  • FAT32.
  • NTFS.
  • Ext2.
  • Ext3.
  • And Ext4.

Take a look at the following detailed steps:

Important: This operation will erase all data on the SD Card. If you don’t want to lose data, then first backup the files on your SD card.

  1. Download, install, and run AOMEI Partition Assistant for free from the official page here . Find the SD Card, right click the partition on it and select “Format Partition” .
AOMEI Format SD Card
  1. Choose one of the listed file systems. If you want you can also change the cluster size or add a partition label to the SD card partition.
Format Partition AOMEI Partition
  1. Return to the main interface. Confirm your operation and click “Apply”> “Proceed” to do that.
AOMEI Successfully Format SD Card


  • AOMEI Partition Assistant comes with many other functions such as cloning hard drives, migrating OS to other discs and so on.
  • AOMEI Partition Assistant can be applied under Windows Server if you apply AOMEI Partition Assistant Server version.

4. Update the driver if the SD Card is not read in Disk Management

If your SD card doesn’t appear after upgrading to Windows 10, you can try to fix this problem by updating the driver for the SD card. Please follow below steps:

  1. Open the Run dialog, enter devmgmt.msc and press the Enter key  to access the Device Manager .
  1. Right-click the SD card drive and select Update Driver Software .
  2. Select  Search automatically for updated driver software  between the two options.
  3. Then, open File Explorer to see if the SD card is showing.

That’s the whole collection of ways to fix the problem of an unreadable or undetectable SD card on a Windows computer. Hopefully this is useful and see you later in the articles about the next technology from Dubidam.ID in the future.

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