APFS

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Abbreviation for Apple File System, APFS is the default file system format for Mac computers and features strong encryption, space sharing, snapshots, fast directory sizing and improved file system fundamentals. While APFS is optimised for the Flash/SSD storage used in recent Mac computers, it can also be used with older systems with traditional hard disk drives (HDD) and external, direct-attached storage. macOS 10.13 or later supports APFS for both bootable and data volumes.

The APFS file system allocates disk space on demand. When a single APFS container (partition) has multiple volumes, the container’s free space is shared and can be allocated to any of the individual volumes as needed. Each volume uses only part of the overall container, so the available space is the total size of the container, minus the size of all volumes in the container.

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Mac User Guide

APFS