Home > Mac OS X > Fragmentation in HFS Plus Volumes Fragmentation in HFS Plus Volumes Eugenia Loli 2004-05-19 Mac OS X 6 Comments Defragmentation on HFS+ volumes should not be necessary at all, or worthwhile in most cases, ’cause the system seems to do a very good job of avoiding/countering fragmentation, says KernelThread. About The Author Eugenia Loli Ex-programmer, ex-editor in chief at OSNews.com, now a visual artist/filmmaker. Follow me on Twitter @EugeniaLoli 6 Comments 2004-05-19 7:56 pm All Filesystems are vulnerable to Fragmentation as the file sizes increase and Free Space is used up. If you have a disk with lots of large files, and not much free space, the Filesystem has nowhere to move a file when it is modified. Modern Filesystems like BFS, ReiserFS, Ext3, HFS+ and NTFS are less suceptable to these problems than earlier Filesystems, but I wouldn’t be Editing that Raw DV Quicktime File on your main hardrive, when you have no diskspace yet, That’s what Scratch-disks are for. 2004-05-19 8:11 pm “All Filesystems are vulnerable to Fragmentation as the file sizes increase and Free Space is used up. If you have a disk with lots of large files, and not much free space, the Filesystem has nowhere to move a file when it is modified.” Very true, but for day to day use, fragmentation isn’t a big issue. I edit a lot of video and regularly defrag all my drives. 2004-05-20 6:16 am old news 2004-05-20 7:40 am i uses mac os x 10.3 server as a file server and it is a issue. i run a defrag once a year or so and usually by that time it needs it and it does help allot. also prebinding and repairing premisions on os x is a must for preformance 2004-05-20 9:28 pm How do you defrag OS X? 2004-05-21 1:48 am 10.3 Defrags any files under 20MB on the fly, in the background.