Too often, they will incorrectly begin to 'repair' your directory, and then give up when they realize that they have modified the directory to an irreparable state. Other products attempt to repair your directory one step at a time, ignoring the big picture of what is truly wrong with your directory, and risking file information that could be saved. This approach has a significant advantage that the others overlook. It fixes any problem with master directory blocks and alternate master directory blocks (HFS), volume headers and alternate volume headers (HFS Plus), volume bit maps, catalog trees, and extents trees. DiskWarrior rebuilds your disk directories making them error-free, eliminating any problems the errors would have caused, and recovering lost files. Directory errors are the most common problems Mac OS users have with their disks. It specializes in eliminating directory errors. It does not attempt to solve all of the possible problems that can occur with a disk. DiskWarrior is not a disk repair program in the conventional sense.
The directories DiskWarrior creates are also optimized for maximum directory performance. It rebuilds your disk directory using data recovered from the original directory, thereby recovering files and folders that you thought were lost. What is DiskWarrior? DiskWarrior is a new utility designed from the ground up with a totally new approach to resolving directory damage.