Although Mac provides one of the most advanced and efficient computing system but appearance of error messages is common for Mac users as well. Mac segment loader error, is such a critical problems for the users. There are many reason which can cause this type of malefic situation such as damaged file system, corruption in binary tree structure, using obstacle drivers, application malfunctioning, virus attack etc. Since Mac segment loader error is directly related to software problem thus executing the FSCK command on terminal in single user mode would not be a bad option. It can easily fix any software issue efficiently and also able to repair corrupted file system as well. However sometimes it also has been seen that improper upgrade of Mac system can also cause occurrence of Mac segment loader error. Therefore in such situation you can reinstall your OS in order to fix this very issue on Mac. Reinstalling the Operating System will completely remove all the upgrades from your system. It may also erase all your important files. However once Mac segment loader error get fixed then you can easily recover all your lost files as well. In order to regain the access of your missing files you can use Mac Data Recovery Software.