By AOMEI / Last Updated May 25, 2020

Help! Windows cannot format SD card

“I have a 128GB SD card however it does not seem to be working anymore. I can’t delete or add files into the SD card. So, I tried to format it through Disk Management. But I find that the Windows cannot format SD card. What should I do? Can you help me? Thanks in advance!”

Why Windows cannot format SD card?

As we all know, formatting a hard drive, USB flash drive, SD card or memory card is a quite easy process and it’s not strange for us. But sometimes you may encounter the problem like Windows cannot format SD card. Why? What is the main causes? Generally speaking, the common reasons for Windows unable to format SD card can be summarized as follows:

  • There is no partition on the SD card so that Windows Disk Management cannot format it.

  • The SD card has virus, so it cannot be formatted.

  • SD card is write-protected or physical damaged, and Windows is not allowed to make changes to it.

  • There are bad sectors on the SD card, Disk Management cannot format corrupted SD card.

Solutions for Windows cannot format SD card

How to format SD card on Windows 10/8/7? Here provides you four methods to solve the problem Windows cannot format SD card:

Solution 1. Create partition on SD card

If there is no partition on your SD card, Disk Management is not allowed to format partitions. At this time, you can create partition directly.

Solution 2. Repair with anti-virus software

If your SD card has virus, you should use an anti-virus software to repair it. After that, you can format it easily via Disk Management or Diskpart.

Solution 3. Format SD card with SD formatting tool

If your SD card is write protected, Disk Management will not allow you to format it. But you can turn to a third party formatting tool to do this operation. Here AOMEI Partition Assistant is highly recommended. It is a powerful partition manager which provides you many useful functions like Format Partition. You can easily format your internal/external hard drive, USB flash drive, SD card, memory card, etc. in Windows 10/8/7, Windows XP, as well as Windows Vista. The specific steps of formatting SD card are as follows:

Step 1. Download, install and run AOMEI Partition Assistant. Right click the partition of the USB drive you want to format and select “Format Partition”.

Format Partition

Step 2. In the pop-up window, choose the file system in your need (such as “NTFS”). And here you can also specify the “Cluster Size” under the file system if you need to. Then click “OK” to continue.

Select File System

Step 3. After that, it will go back to the main interface. Preview the changes and click “Apply” > “Proceed” to complete the operation.

Apply Proceed

Solution 4. Check bad sectors

If there are bad sectors on the SD card, Windows Disk Management is not allowed to format corrupted SD card too. And you should check bad sectors and repair the corrupted SD card at first. After that, format it normally via Diskpart or AOMEI Partition Assistant.


While you encounter the problem Windows cannot format SD card, you should make sure the causes of the problem at first, and then choose the appropriate solution to deal with it. AOMEI Partition Assistant can be the best SD card formatting software. Besides format partition, it also provides you many other powerful functions. Such as Delete/Resize/Check Partition, Create Bootable Media, Migrate OS to SSD, Copy Partition, Wipe Hard Driveand so on. If you encounter the problem c drive full, you can upgrade to AOMEI Partition Assistant Professional to fix it. If the operating system of your computer is Windows Server, you should turn to AOMEI Partition Assistant Server to do this operation.