Data can’t automatically migrate itself to the outer edges of the platters to fill in available space, so after many read/write cycles have been completed, there are gaps where large files cannot be written. New data is generally written to the outside of the platters, with the read/write heads moving in toward the center as more data is stored. HDDs use a magnetic read/write head to access rotating round platters that usually spin at either 5,400 or 7,200 revolutions per minute (see image above right). In this article, we’ll discuss why defragging Mac HDDs is usually unnecessary and how to do it if you’re one of the few users who may actually benefit from the process.ĭefragging is a slang term for “defragmentation”, which is the process of organizing files on a HDD to optimize how it accesses those files. Like all computers, Macs tend to slow down a bit after a few years of usage, and those readers who are new to the Mac might think that the old Windows solution of “defragging the hard disk drive” (HDD) might help. Macs are more popular than ever, thanks to a “halo effect” from buyers of iPhones and iPads who decide to make the switch from Windows to macOS.
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