![]() The users most prone to fragmentation on Mac are those who work with multimedia files – large image files, videos or sounds – regularly. The article also states that older hard drives are more prone to fragmentation, as the Mac OS X HFS Plus system automatically defragments itself through a process called Hot File Adaptive Clustering (HFC). So, users who regularly change Macs or external hard drives probably never need to defragment. ![]() The benefits of defragmentation are obviously faster access to data and therefore a gain in performance. Historically included in the operating systems of Windows, Apple does not consider it necessary to incorporate it into its OS, for good reasons as we will see. I will not explain what the cause of fragmentation of a disc is because all explanations are available online in a well-known encyclopedia. I will focus here on why and how to defrag a Mac. Indeed, there has never been a defragmentation utility in the different versions of OS X, and there is still none in Yosemite.
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