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: DiskWarrior 5.
Media, such as hard drives, eventually fails. Or you can make the kind of mistake that results in deleted folders or erased disks. And files can simply get corrupted.
How to update DiskWarrior 5 using the DiskWarrior 5 Updater.