How to turn a windows install usb drive into a normal drive

[pirinen.anatoli]

I have a usb drive that is used for installing windows 10. I don't really need it anymore so I thought I should turn it into a regular thumb drive. Wouldn't mind having 14GB of extra storage, right? So I tried to format it but the computer says it is write protected. I tried to remove the write protection by using cmd and diskpart. The computer said that it was removed succesfully but when I try to format the drive, it is still write protected. I tried to do it through regedit, but it still didn't work.
So my question is, is there a way to do it or is it write protected forever?

 

[alexoiu]

Is there a switch on it? http://cdn.makeuseof.com/wp-content/uploads/2013/05/usb-switch.jpg?edc8eb

 

[pirinen.anatoli]

Is there a switch on it? http://cdn.makeuseof.com/wp-content/uploads/2013/05/usb-switch.jpg?edc8eb

No. It is the most basic type of windows install drive.
Like this one:
https://www.google.fi/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=0ahUKEwiP9a2S74nYAhVHqKQKHcaqDF4QjRwIBw&url=http%3A%2F%2Fwinfuture.de%2Fnews%2C88344.html&psig=AOvVaw3o-uLzoaUILmbvMshEp6zR&ust=1513353455197829

 

[alexoiu]

Not sure about the issue, then. I'd not bother with it and keep it like that... just in case.