I had my hard drive upgraded from a 250gb to a 750gb 7200 rpm hard drive on my 13" mac book pro mid 2010. I used "disk Utility" to verify the new hard drive, I got an error message saying that I had an "Invalid volume file count" and an "Invalid volume directory count", it also said "The volume Macintosh HD was found corrupt and needs to be repaired". I ran "Repair Disk Permissions" about 3 times yet the problem persist. Is this a normality after replacing a hard drive from a smaller one to a much larger one? If not how do I remedy this situation ?