Share your experience!
Try to low level format the sd card using an adapter.If you download a file explorer,cannot you move files?
Look, if u have all private data and camera photos saved at sd card. Like movies and pictures.
Download a file explorer from google play and try to move using that file explorer.Look for androzip,es explorer.
Probably you have apps that store data on your internal phone.Try to clear data for apps you do not use and remove them.