Mac error 254 is a common issue for Mac users. There are various reasons which can cause this very error in Mac system such as damaged file system, corrupted registry file, installation of Malware programs in system, software incompatibility, corrupted or missing ISO, hard drive crash, corruption in catalog file etc. No matter what the reason is but it can cause many serious problems for you. Due to Mac error 254 you may face improper functioning of Mac system, abrupt termination of any running process and furthermore critical data inaccessibility issue as well. However but you can resolve this error completely from your system by repairing the corrupted ISO. You can run Disk Utility in order to repair ISO and fix Mac error 254. But if this problem still persist in your system event after using Disk Utility as well then in such situation you will have to create a new ISO and remove the corrupted one from your Mac machine. However it is a very critical process and may cause data inaccessibility issue for you. But you use Mac data Recovery Software to recover all your corrupted, lost or inaccessible files on Mac and fix Mac error 254.