The macOS High Sierra Post-Install Upgrade to APFS
- Of course, compete the installation in the normal fashion. If the upgrade to High Sierra seemed normal, continue to step #2.
- Restart the Mac into Recovery Mode. To do that, select Restart from the Apple menu and hold down the Command and “R” keys (often abbreviated as CMD+R) until you see the Apple Logo or a spinning globe. You’ll be dropped into the macOS Utilities.
- Launch Disk utility. Click-select your named boot volume. (Not the physical drive above it.) In this example, it’s called “John’s-MacBook.”
- In the Disk Utility Edit menu, select “Convert to APFS.” (It will be dimmed if you didn’t properly select the boot volume.)
Disk Utility Edit menu showing the Convert to APFS option
- You’ll get a confirmation dialog box. “Would you like to convert Your-drive-name to APFS? The box notes: “APFS volumes cannot be used with older versions of macOS. Converting to APFS cannot be undone.” Click on the “Convert” button.
- When the conversion starts, you’ll see a progress indicator with all the geeky details if you elect to show them. Click Done when that button becomes undimmed.
APFS conversion progress. It goes fast.
The results of the conversion will be reported to Apple for QC analysis. This is okay to allow.
The size of the SSD in my MacBook is 256 GB. It took approximately two minutes in my case. That’s fast, and it’s just another indication of the brilliance of Apple’s APFS team.
If you’d like the warm fuzzy of seeing that the drive was converted, on the Mac’s desktop, click-select the boot drive icon. (If you don’t see it, you may have to reveal it with Finder > Preferences > General) Then hold down the Command key and type “I” (CMD+I) for “Get Info.” You’ll see something ike this:
Get Info for an APFS volume.