I encrypted my phone but now want it not encrypted so have to factory reset. However, if I try to do this from the CWM Recovery it says
-- Wiping data... Formatting /data... Error mounting /data! Skipping format... Formatting /cache... Formatting /sd-ext... Formatting /sdcard/.android_secure... Error mounting /sdcard/.android_secure! Skipping format... Data wipe complete.
When I try to factory reset from the normal GUI it doesn't give me an error but finishes very very quickly and hasn't worked (presumably the output above has happened in the logs).
What can I do?