well i've always noticed that only one disk defrag program i have ever used ever worked right (Norton Disk Defragmenter 2.1.4 for System 7 altho it wasent compadible with MacOS Exctended partitions), that is that it placed all the data ALL the data at the begining of the drive organized from least used to most recently used whereas Windows Defrag just leaves the data in chunks ALL over the disk whever it happend to come together and i dont perticularly care for that