![]() 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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