When macOS encounters a physical or virtual disk, it is given a disk identifier, of the form /dev/disk N, where N is an integer starting from 0. This article attempts to explain how this comes about, and how it works (differently) in APFS, and is part of a series which will eventually look at the boot process in its traditional form, in APFS, and Apple’s new Secure Boot. In Terminal, though, and it tells me that my iMac has four disks (disk0 to disk3), with a grand total of 12 partitions, from disk0s0 to disk3s2. Disk Utility displays them as two ‘disks’, each with a single volume. If you’ve ever used a command tool which works with disks and volumes, you’ll be aware of the fact that what the Finder shows, and even what gets listed in /Volumes, is only a fraction of what macOS knows about.Īccording to the Finder, and /Volumes, at the moment this iMac has two storage systems accessible: its internal Fusion Drive, and an external RAID array which is used for Time Machine backups.
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