Alsoft today released DiskWarrior 4, the latest version of its hard drive utility for Mac OS X. Version 4 offers: Universal Binary support; significant speed improvements; repair of invalid file permissions; includes an additional suite of file and folder tests, to find problems before they cause you trouble; recovers more data from drives with hardware malfunctions; repairs and rebuilds FileVaults; repairs and rebuilds Attribute B-trees; and much more. DiskWarrior 4 is priced at US$99.95 ($49.95 upgrade).