As part of macOS High Sierra, Apple has added a new feature to Apple software updates which require a restart. When these updates are installed onto a boot drive which is using Apple File System (APFS), an APFS snapshot is automatically created on the boot drive prior to installing the software update. An APFS snapshot is a read-only copy of the state that the boot drive was in at a certain point in time, so it can be used as a backup in case something goes wrong with the update.
Update 11-2-2017: Apple has a KBase article which references this behavior:
The KBase article notes that a snapshot is made before macOS updates are made, which may mean that not all updates that require a restart will generate a snapshot.
In the event that the Apple software update causes post-installation issues, you can boot to Recovery HD and…
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A while back, I wrote a post on how to resize the boot drive of an existing virtual machine. However, that guidance only applies to a boot drive that uses HFS+ for its filesystem.
Now that Apple File System (APFS) is available and the default file system on macOS High Sierra, a different procedure must be used in order to resize the APFS-formatted boot drive of an existing virtual machine. For more details, see below the jump.
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