Several times while using the system you may come across caution sign on Mac which makes you frustrated by restricting you from accessing required data. There are numbers of warning signs arises during access of Mac machine, among them few appears while opening the computer or some of them evoke while accessing file or folder. Among different caution sign on Mac some of them can be faced in form of Prohibitory sign, Monitor Smart warnings, caution with Logos, warning with question marks etc. Due to appearance of such unexpected messages on the screen user get tensed and want to overcome it quickly, because it completely restrict users to access related items. It is almost data loss situation in which user can only see their file on Mac machine but unable to open them. Some of the caution sign on Mac can be resolved manually, but it needs technical skills. If you have such type of knowledge then you can go for attempting it, but when you are unable and do not have valid backup of inaccessible files then do not take risk. It is better to leave this option and opt for Mac Data Recovery Software to again access files even after getting unwanted caution sign on Mac OS X.