wrote: >So if some users find defragin un necessary then how do you explain >the mac os inability to keep with the 15% rule. Which states that in >order for directory to be successfully rebuilt that the directory >should have at least 15% of the hard drive space continous free >space. How many times have I gotten an error in diskwarrior stating >that a fail safe rebuilding of the directory is not guaranteed >because the drive is to framented. Which means to me that if the OS >is doing it's job of defragin itself then this should not be a >problem. get a bigger drive. trying to defrag an overly full drive isn't going to solve the problem. it's a sugar pill. the root of the problem is a lack of space. don