My macbook (see signature for specs) recently went into the apple store to have the logicboard replaced. It came back fixed but now the amount of space left on my HDD is reading incorrectly. When it says I have around 7.3 GB of space left on my HDD, I actually have zero. (Verified by several means). I have repaired disk permissions to no avail. Is there anything else I can try to reset the correct count?