On September 5, 2017, Apple published a technical note titled Prepare for APFS in macOS High Sierra. High Sierra will be available on September 25, and most of the questions we’re getting about the new operating system revolve around the new Apple File System (APFS). Probably the most important information in the article from Apple is this quote:
Apple File System (APFS) is the default file system in macOS High Sierra for Mac computers with all-flash storage. APFS features strong encryption, space sharing, snapshots, fast directory sizing, and improved file system fundamentals.
When you install macOS High Sierra on the built-in solid-state drive (SSD) of a Mac, that drive is automatically converted to APFS. Fusion Drives and hard disk drives (HDDs) aren’t converted. You can’t opt out of the transition to APFS (our emphasis).
If you install APFS on any Mac that uses a solid-state drive (SSD) as a built-in boot drive, it will automatically convert to APFS and you will not have a choice. Those Macs that use Fusion Drives (like the iMac, for example) or regular hard disk drives (HHDs) will not be converted, period.
Here is the rest of the technical note verbatim:
Devices formatted as Mac OS Extended (HFS+) can be read from and written to by devices formatted as APFS.
Devices formatted as APFS can be read from and written to by:
For example, a USB storage device formatted as APFS can be read by a Mac using High Sierra, but not by a Mac using Sierra or earlier.
FileVault volumes are converted from Mac OS Extended to APFS, just like unencrypted volumes.
Boot Camp doesn’t read from or write to APFS-formatted volumes, but is compatible with High Sierra.
So, one more time with feeling:
Have any questions? Leave ’em in the comments and we’ll try to answer to the best of our knowledge at this time.
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