Macintosh is one of the most advanced computing machine and provides various useful features which can be used for repairing disk failed with error could not unmount disk. In such situation using Disk Utility or FSCK would be the most suitable option in order to deal with this issue. With the help of Disk Utility you may fix the corrupted file system and damaged data structure. But in case if it fails to resolve the problem then the only option left for repairing disk failed with error could not unmount disk, is to format the complete Mac hard drive. By formatting the entire disk drive you can easily remove all the issues behind the emergence of this very error into your Mac system. However it will also cause removal of all your important files from entire disk drive but it will resolve the problem completely as well. You can recover all your important files once repairing disk failed with error could not unmount disk get fixed completely on your system. Fortunately Mac Data Recovery Software is there to retrieve all the lost after any kind of critical data loss situation. It can easily rescue any lost, deleted, formatted or inaccessible files on Mac. Therefore it is recommended to use Mac Data Recovery Software in order to recover all formatted files and repairing disk failed with error could not unmount disk.