Mac error code 0 is a common issue for Mac users, mainly encountered while copying large files to external hard drive which is formatted with FAT file system. Actually the problem with FAT file system is that it has a size limit of 4GB which often creates difficulties while storing any large file. In order to fix Mac error code 0 you can try Disk utility. Compressing the large file in several small files will also resolve the problem. However but the most simplest and efficient way to troubleshoot this problem is to format the hard drive HFS+ file system. Formatting the drive with HFS+ partition will completely resolve the Mac error code 0 issue efficiently but it will also cause loss of all your important files stored on the hard drive. In such situation you will have to use third party tool to restore data after formatting the hard drive. Mac Data Recovery Software is the most sophisticated tool to retrieve all formatted data on Mac. It can also be used to rescue any deleted, lost, inaccessible or corrupted files as well. Therefore it is recommended to use Mac Data Recovery Software to restore all the files after formatting hard drive and fix Mac error code 0 issue.