The OS X Recovery partition complicates booting into the utility. Bottom Line While other data recovery utilities can scan disks to recover lost or deleted files, DiskWarrior is unrivaled in its ability to repair and rebuild the Mac directory. In fact, that isn't entirely true: Apple once bundled the third-party utility with AppleCare. In fact, Alsoft DiskWarrior 5 is one of the best utilities you can buy for your Mac. While Alsoft has updated the utility and adopted flash storage over the past 18 years, DiskWarrior continues to perform maintenance and recovery tasks that no other utility can do. That includes utilities from Apple, whose Disk Utility may be suitable for basic maintenance and partition, but remains ill-prepared to repair badly damaged directories that result in kernel panics and boot failures.
Flash and SSD drives, internal and external drives are supported. Support for all of the above is dependent on the hardware features of individual Mac models and the version of OS installed. Compatability Notes:
How to install DiskWarrior on macOS 10.15 Catalina.