uhm, do you get the notifaction to format your internal sdcard, if not just go to settings>storage>go down and look for "format sdcard"
i know it says sdcard but it format your internal card and not the external, but there's one problem it deletes your app data (its just fresh app)
and everthing on your internal, so picture music is gone. but i think that is better than having a broken internal sdcard.
i hope this works
Device: Samsung Galaxy S2 GT-i9100
Rom: Slimbean Unofficial By FusionJack
Kernel: SlimBean Unofficial Kernel By FusionJack
SDCard: 16GB Samsung original class 6