![]() This includes SoftRAID volumes which contain HDDs.įor a more detailed description of why the copy-on-write feature of APFS results in slow performance with HDDs, check out this video starting at the 3:20 mark. Time Machine volumes must be formatted as APFS if you are running macOS 11 or later. For this reason, we do not recommend using APFS on volumes containing HDDs unless you are using the volume for a Time Machine backup. ![]() Copy-on-write is used anytime: a file is copied or duplicated in the Finder and where both copies are on the same volume, when a snapshot of a volume is created or whenever any of the most popular backup utilities are used to back up a volume. Go to the non-intended entry and look for the media in the name. ![]() Go to show all devices by clicking in the upper left section. Open the disk utility in theUtilities menu by selecting applications in the finder menu. The slowdown will occur on any file which is written after being duplicated with the copy-on-write feature. The quick steps to format the drive to APFS on macOS Catalina, macOS Mojave, and macOS High Sierra are: Step 1. ![]() This can happen after just a few weeks of use on any APFS volume which uses HDDs. Unfortunately, one of these features, copy-on-write, can result in a volume that quickly becomes unusably slow. We recommend using APFS whenever you are creating a volume which only uses SSDs as this allows you to take advantage of these great features. It offers a host of features not found in HFS+, including native encryption, copy-on-write, snapshots, and greatly improved volume stability. APFS is Apple’s first new file system in over 30 years. ![]()
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