I just tried using my lacie 120 external HD with my 15inch PB, but the HD wont mount on my desktop...the computer recognizes it and i went in to disk utility and it said "Verifying volume LaCie 120 GB Checking HFS Plus volume. Checking Extents Overflow file. Checking Catalog file. Invalid sibling link The volume LaCie 120 GB needs to be repaired. Error: The underlying task reported failure on exit 1 HFS volume checked Volume needs repair " I then tried repairing it, but it did the same thing. What could be the problem and what can i do?