Hi. You need a software that can scan/parse a corrupt card. This should do:
That mainly happen because of non-journalized file system. note that scaning a card without the filesystem normal way can be really long (a whole night).
The one i mentioned mention they can work with corrupt card, try it and see. I have one in mind that i know work for sure but the name escape me right now.
I remembered the name of the one i used to work with: