By AOMEI / Last Updated May 25, 2020


I have a MicroSD card reader in my notebook. When I insert a MicroSD memory card into it, I can't write any data on it - it's read-only. The same thing happens when I try to do it under root. And I can't change the permission policy for it. Can someone help me? Any advice would be appreciated. Thank you!

How to fix SD card mounted as read only?

When your SD card is mounted as read only, it prevents you from writing, deleting, copying or moving data on it. It will cause much inconvenience. To fix this issue, you can first check if your Switch Lock is slide up or down. Some of the SD cards comes with SD adapter that has Switch Lock. So, make sure that your Switch Lock is Slide Up (unlock position). If your Switch Lock is slide up and the SD card is still in read only state, you can use the following 2 methods to fix it.

Method 1. Remove read only on SD card with diskpart

Step 1. Plug the read-only SD card into Windows. Click Start, typecmd in the Run dialogue.

Step 2. Type diskpart in the command prompt and run diskpart.exe.

Step 3. Type list disk. Now you'll see all your connected drives, find which one is the card drive.

Step 4. Type select disk n, where n represents the disk number of your SD card drive.

Step 5. Type attributes disk clear readonly, and it will remove read only for your SD card.

Remove Read Only

Now open your SD. You should be able to edit, delete, copy or move files.

Method 2. Fix SD card mounted as read only with AOMEI Partition Assistant

AOMEI Partition Assistant is a free partition manager that can be used in all versions of Windows 10/8/7. It can help you to format all types of disk including SSD, external hard drive, USB drive, all kinds of SD card, etc. You can remove read only SD card easily with this software.

Step 1. Download AOMEI Partition Assistant, install and launch this software.

Step 2. Right click the SD card that you want to format and choose Format Partition.

Format SD Card

Step 3. Choose one among listed file systems: NTFS, FAT32, Ext2, Ext3, exFAT. Then, click on OK.

Format as NTFS

Step 4. It will return to the main interface of AOMEI Partition Assistant. Review pending operation and click Apply to perform it.

Note: Formatting the SD card will delete all data on it. Therefore, you shouldbackup the SD card in advance.

The process will be done in quick time. After formatting the SD card, it will be writable again.


With the help of AOMEI Partition Assistant, you can fix SD card mounted as read only easily. Also, it breaks the limitation of 32GB in partition size, thus it can help you to format 64GB SD card partition to FAT32. If you want to format the SD card using the command prompt, you can upgrade to the advanced version of AOMEI Partition Assistant.