When browsing 10.15 and 11 Volume Groups from Big Sur, or 10.15 from Catalina, there’s one discrepancy in paths which alters depending on whether that Volume Group is that used for the current boot, or is non-boot. /Volumes/ for the non-boot Data volume.Ĭatalina behaves the same, unless the non-boot Volume Group has Big Sur installed, in which case it can’t mount that System volume properly./Volumes/ for the non-boot System volume./Volumes/ for the boot Volume Group, integrated by its firmlinks.Using to represent the name of the System volume (commonly Macintosh HD), and the name of the Data volume (Macintosh HD – Data), you should see If you have a disk containing a non-boot Volume Group, such as a bootable external disk, that has separate entries for its System and Data volumes. Of course the user isn’t supposed to use any of those system-level folders and volumes, and Apple may in a future update hide them away.Ī fuller history of boot disk structure is here, and a current account of the containers and volumes for M1 models is in this more detailed article. xART or xarts, shown as a volume or folder, which may contain files and folders or appear empty.Update, shown as a volume, containing files and folders.Recovery, shown as a folder not a volume.iSCPreboot, shown as a volume or folder, containing files and folders.Hardware, shown as a volume or folder, containing files and folders.FieldServiceDiagnostic, an empty folder.The contents of those two new partitions are also mounted alongside the Data and other standard volumes in /System/Volumes. Neither of those is present on external bootable disks for the M1, where the traditional EFI partition is present instead. Instead, they have two additional partitions, named Apple_APFS_ISC and Apple_APFS_Recovery, of about 520 MB and 5 GB size respectively. Internal disks of M1 Macs are unusual in that they don’t contain a top-level EFI partition. Note that, at least in macOS 11.1, the seal on the unmounted read-only System volume is normally broken, but it’s the snapshot which is the important one: that should be sealed, unless you have broken its seal intentionally. VM, containing virtual memory caches, which is upwards of 20 KB depending on use.Recovery, the Recovery Volume, of around 600-950 MB.Preboot, a small volume of around 350 MB.On Intel Macs, this is given its full name, but on M1s it’s named simply Data the writable Data volume, by default on the internal disk named Macintosh HD – Data, which is normally hidden from view at /System/Volumes and accessed via firmlinks. The snapshot is named -update- followed by its UUID, and the volume (hence its snapshot) is typically about 15 GB in size the SSV, a mounted snapshot of the unmounted read-only System volume named Macintosh HD, which forms the root of the boot file system.Detailed information for Catalina and earlier is here.īig Sur goes further than Catalina in that its System volume is now the mounted snapshot of a sealed volume known as the Sealed System Volume (SSV). This article summarises all you need to know about the layout of APFS boot disks and volumes in Big Sur, whether running on an Intel or Apple Silicon Mac. When you format a disk and install Big Sur on it, making it a startup or boot volume, it has a standard structure, something that has changed greatly over the last few years.
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