I have recently booted up from my startup disk and after running the disk utility, i get the error message reading Invalid sibling link. The volume Macintosh HD needs to be repaired. Error: The underlying task reported failure on exit. After looking into it, it seems as though i need a program that could restore data from a damanged volume. However, the only program i found, being DiskWarrior, has a price tag of 80$. I personally dont have that much coin to throw out right now, so i am curious as to if anyone has found a free alternative? Thank you very much. Merry Christmas.