how to overwrite a write protected SD card

[Android Central Question]

My SD card is locked with write protection. I want to unlock my card to store extra files on it

 

[Kodak2]

Is the physical switch on the card in the unlocked position?

 

[Rukbat]

The microSD card in a phone has no physical "switch" for write protection. An Android app can't write to a folder it didn't create and, since 4.4.2, that applies to the SD card as well. Your file manager app should be able to write to the card if you give it permission to (each app has a different way of doing that), but app A can't create a folder that app B can write to unless you root the phone and make the card available for writing to the user (you have to modify platform.xml - see this tutorial, method 1 [method 2 works also, but you still have to root]).