How to Format Write Protection on a Micro SD Card

By Ty Arthur

Updated September 28, 2017

Format Write Protection on a Micro SD Card
i SanDisk

Although Micro SD cards are primarily used to store photos or video files from digital cameras, they can also be used to store any other type of data such as word documents or executable files. If multiple people have access to your Micro SD card, enabling the write protection feature will ensure that the data currently saved on the card cannot be modified or deleted in any way without first having the feature turned off.

Feel along the lower right and left sides of the Micro SD card to find out if it has a built in write protection switch. Move the switch over to the "On" position to turn on the write protection feature.

A Card Reader

Check the front ports on your computer and see if it already has a built in card reading unit. Purchase an external card reader that plugs into a USB port if your computer does not already have an internal card reader (see Resources below). Plug the card reader into any open USB port on the computer.

Power on the computer and let the operating system finish loading. Insert the card into the Micro SD slot on the card reader. Wait for a new window to appear that will ask what action you want to take with the Micro SD card. Click on the link that says "Open a folder to view files."

The Read Only Button

Right-click on a file if there is just one specific file you want to enable write protection for. Click on the "Properties" link from the menu that will pop up. Navigate to the "General" tab. Click on the box marked as "Read Only" and then close the Properties window.

The Permissions Chart

Close the window and then double-click on the "My Computer" icon on your desktop if you want to enable write protection for every file on the Micro SD card. Right-click on the name of your Micro SD card in the list of computer drives. Click on "OK" and then close the window.

Click on "Properties" and then navigate to the "Security" tab. Scroll down to the heading labeled as "Permissions." Click on "Deny" under the "Write" section.


If you enable write protection and then log in to your computer's operating system under a non-administrative account you will not be able to remove the write protection feature until you log in as an administrator.