This last week, as I was upgrading both my network ( read about it here) and two of my production RAIDs, I was talking with the support team at OWC. However, over the years, as I moved from single drives to RAIDs and shared storage, I let my version of DiskWarrior fall out of date until, finally, with the update to Catalina, I took it off my system. DiskWarrior, from Alsoft, is a one-trick pony: it repairs and optimizes files and disk directories.