Defragmentation on Mac OS X

Discussion in 'iMac' started by ventuss, Oct 1, 2013.

  1. ventuss macrumors 6502

    Joined:
    Oct 9, 2011
    #1
    Files, particularly large ones, on HDDs usually become fragmented over time if frequently written; periodic defragmentation is required to maintain optimum performance.

    How do you work on defragmentation on Mac OS X?
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    You don't. The HFS+ filesystem takes care of it automatically.
     
  3. ItWasNotMe macrumors regular

    Joined:
    Dec 1, 2012
    #3
    OP said large files; HFS+ will only defrag files less than 20MB (not large IMHO) plus a host of other conditions

    If you OP really feels need to defray than try something like iDefrag - offers other options as well such as compacting free space

    Note with todays multi-TB drives can take a very, very long time to fully defragment a disk and to do it properly disk needs to be off-line. Only really worthwhile if there are many large files that are very fragmented and are constantly being read.
     
  4. Bear macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #4
    I wonder how defragmenting a Fusion Drive would affect the performance of it as defraging a Fusion drive could potentially move hot files off the SSD portion.
     
  5. Intell macrumors P6

    Intell

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    Jan 24, 2010
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    #5
    Post Lion HFS+ will defragment files up to 500GB when idel.
     
  6. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #6
    With very few exceptions, you don't need to defrag on Mac OS X, except possibly when partitioning a drive. About disk optimization with Mac OS X
    If you're having performance issues, this may help:
     

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