Is my SD card broken?

[Mansta8]

Well I made a backup of my SD card to fix the music and I tryed to defrag my card, and it said something about not being able to remove anything because of the Read only status. When I went to the properties and unchecked read only, pressed apply, It did what it was spposed to do. And when I looked at the propertys it was still marked as read only I did this multiple times before, why is it doing that now?
(This same thing has happened where I was playing the game and randomly my textures were renamed to something like TOONL~1 and were un loadable.)
I just checked and I am unable to delete my backup
Will I need to get another SD card?

[SmashClash]

Is the little thing on the side(slideable) on the wrong side?
Try switching it to see if it works.

[Mansta8]

I looked at it, but it wasn't locked.

[(specter)]

I had the same problem with my old SD card and I asked for help on this forum and also on a computer help forum, and no one could help and they just said my SD card is dead. I got a new one and it works fine. You may have to do the same.