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Run First Aid on your APFS boot disk and the same checks are made as on an HFS+ disk, including the partition map and EFI partition. On completion of any repairs, the volume is mounted again. Is then run on each available volume, which checks its HFS+ file system in full. Run First Aid on an HFS+ volume and the volume is first unmounted, and the command

Other volumes on that disk aren’t checked at all. Core Storage Physical Volume partitions.Miscellaneous features including loader spaces and booter partitions.Run First Aid on an HFS+ disk and the following are checked: If you run First Aid on a volume, Disk Utility verifies all the contents of that volume only.” “If you run First Aid on a disk, Disk Utility checks the partition maps on the disk and performs some additional checks, and then checks each volume. Read Disk Utility’s Help book, and you might wonder why there’s any need for this article. The version that I’m using is 19.0 (1704), as supplied with macOS Catalina 10.15.7. In this article, I look at one of Disk Utility’s most essential features, First Aid, and how it works on different disk formats (HFS+ and APFS). This vital tool had been evolving steadily to accommodate the quirks of Apple’s new file system APFS, through a period of turbulence during which some features haven’t worked right, and others have just been puzzling. Recent versions of Disk Utility have changed.