I too have used DiskTracker for years and love it. Problem is that there is a code dependency with an old Apple method for enumerating directories, and this dependency limits its functionality to disks containing less than 32k items. This never was a problem for me until I hit 750GB drives. Fortunately, Portents is upgrading the code and making the app Universal, so I expent a fix in another two months or so. Meanwhile, DiskTracker works great on optical disks and the smaller drives. Best Wishes, -Said >I've use DiskTracker (.com) for years. It works very well and has a >batch disk scan and mounted disc scan commands.