I'm afraid to say, this software gives false results in 10.3. I was using it to determine how fast SCSI arrays perform, and decided to try it on a number of external drives, including firewire ones. The results I got were way too high - 64MB/sec for a Powerbook in target disk mode in a sustained transfer - I don't think so! I selected a network mount connected via a 10/100 switch and it was claiming similar speeds, with no network activity! I don't want to think that the program is faking results in demo mode, but either that, or it's reading data from the disk cache, not the disk. That would explain the impossible speeds.