Mac is considered as a best and safest computer which is used by millions of user across the globe. There is no doubt that it is one of the best computer system ever but still user’s have to face some problem. Using Mac computer one can face several kind of error message and error Mac can’t repair external hard drive is one of those error which is like nightmare for Mac user’s. This error message usually happen when the drive is previously accessed in Windows OS. In many cases this error is vigorous enough to data loss. Continue reading to get rid of this situation.