To create a valid APFS disk image, device needs to be an APFS container or contain an APFS container partition.” If you want to create an image of a volume (or do almost anything else with disk images), then you’re much better off using C-Command’s excellent DropDMG. There are hints about this in the hdiutil man page, where it warns “with APFS, imaging from a device that is an individual APFS volume is invalid. My first discovery is that Disk Utility can’t create a disk image from an APFS volume at all, despite the promises in its Help book. That sounds strange, as if it hasn’t been updated for APFS, as Apple’s new file system’s volumes don’t have any free space of their own. When creating one from a disk or volume, the image contains the whole of that item, including free space, whereas creating one from a folder only occupies the space needed to contain its data. What happened wasn’t what I expected, nor what it documented in its Help book.Īccording to the Help book, Disk Utility can create a disk image from a disk, volume, folder or connected device.
Lazy unmounting a mount point is beneficial when we don't want to unexpectedly kill the process which are accessing the file systems as this may lead to loss of data or may corrupt the file systems.įor example, when you are copying a file from the mounted flash drive to linux machine and need to unmount the mounted device at the same time so that you don't need to actively check the status of the file transfer, you can execute a lazy unmount on the flash drive so that once the operation to copy the file is complete, the system automatically detaches the mount point of the flash drive.For various reasons, one of them sheer curiosity, I wanted to image one of my disks, and turned to Disk Utility (version 19.0 (1704), as supplied in Catalina 10.15.6). The command removes all references to the detached file system as soon as it is no longer busy. Once no processes are accessing the unmounted file system, the umount command executes and actually detaches the file system. Lazy unmounting is used to unmount the mount point from the Linux filesystem hierarchy.
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