At 7:22 PM -0500 2/11/2009, Charles Davis wrote: >On Feb 11, 2009, at 2:31 PM, williamd wrote: > > Can someone please tell me the difference between HFS+ and HFS+ >> Journaled? Many thanks. > >HFS+ is Apple's standard file system for the recent past.
And is still the current standard. The journaling is just an add-on, as it were. >HFS+, Journaled, is HFS+ with the 'Write' operation 'enhanced' by >first writing out information as to what the write is going to do. The file system writes a journal entry when *directory* (folder) changes are made. This is faster than re-writing a *whole* directory each time. NO extra writes occur when the data in a *file* is changed. >The 'Journaled' version HAS to be slower, because of the extra steps >involved, but it provides >another level of 'data security'. The link provided previously in this thread is good, but I disagree with the author's conclusions. Normally, directories are cached in memory and only written to disk periodically. If your directories are large, this can mean looooong writes. With journaling, tiny journal entries are snapped to disk as needed. The whole directory is written far less often .... which is a net performance improvement. >My own decision so far --- Hard Drives ---> Journaled >Jump drives, Thumb Drives etc.---> HFS+ ONLY yea. Do *all* your hard drives HFS+ Journaled. Doing memory sticks and camera cards as just HFS+ is ok IF you're careful enough to never pull them before properly dismounting. Given their inherent error rates, personally, I *want* that journal. And if those journal writes appreciably reduce the cycle life of the flash memory, then that stick had other problems. - Dan. -- - Psychoceramic Emeritus; South Jersey, USA, Earth --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to Low End Mac's iMac List, a group for those using G3, G4, G5, and Intel Core iMacs as well as Apple eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/imaclist?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
