A year later, in 2003, Hot File Adaptive Clustering arrived, which identifies files that are frequently accessed but rarely updated and moves them to a special area of the drive, defragging them during the process.Īpple then introduced APFS (Apple File System) in High Sierra in 2017. Then in Mac OS X 10.2, which arrived in 2002, the system got even cleverer at avoiding fragmentation. HFS+, which was introduced in 1998, could defrag files on the fly thanks to Hot File Clustering. ![]() Mac do not need to be defragmented because the file system (initially HFS+ and more recently APFS) prevents fragmentation and automatically defrags files if necessary – if the file has more than eight fragments, or is smaller than 20MB, it will be automatically defragged.
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