With Journaling turned on, the OS keeps a transaction log of changes to the file system so that, in the event of a crash or power failure, the file system can be restored to a good state much more quickly than if Journaling had not been enabled. It has been recommended by many to leave Journaling turned on. If you're doing a lot of work with large video files on another drive, it has been suggested to turn Journaling off on that drive to avoid a performance hit. Tony On 16-Jan-08, at 7:06 PM, Eric Smith wrote: > > This brings up another question I have. When would you want to use > Mac OS Extended Journaling (vs. non-journaling)? > > Thanks, > Eric