This command will show you what disk partition is mounted as the root filesystem (/) and with what options – there is a bracket and first word inside should state ‘hfs’ or ‘apfs’. To determine filesystem you are using now, type the following in shell: mount | grep ' / ' To determine OS X or macOS version, open Terminal.app and type: system_profiler SPSoftwareDataType How to determine macOS version and filesystem type In System Installer, choose “Utilities” and “Terminal” from the top menu To open Terminal on a working system, press command+space and type “terminal.app” and press enter. If it is possible for Apple to update Recovery Mode images for a few recent versions of OS X / macOS, this would save hair on people’s heads.įor now, if you can’t backup your data and you want to upgrade your operating system to High Sierra, you can choose to keep HFS+ and here’s how.Ĭommands used below should be typed in the terminal (for example Terminal.app). For those people, it may have looked like their data was destroyed, while simply the Recovery Mode couldn’t mount APFS filesystems. And when trying to boot Internet Recovery, they are still downloading a Recovery Mode that knows nothing about APFS. Some people reported problems: after High Sierra installer changed their filesystem from HFS+ to APFS and the installation was interrupted, they were unable to boot. If you bought your Mac with Sierra or earlier operating system, when you boot your Mac with command+option+R key combination, the Recovery Mode and Installer for Sierra are being downloaded. It seems that Apple didn’t think all things through and haven’t updated the images of Internet Recovery Mode, which you can automatically download and run in case of local Recovery Mode being erased.
I did some benchmarks on the speed differences between HFS+ and APFS filesystems, should you want to you know what differences may be expected from the change. I’m not saying which filesystem is a better choice.
This howto (hownotto) only shows how to keep HFS+ filesystem during macOS High Sierra upgrade. This is not a “you should”, it’s a “you can” It is however still possible to avoid filesystem conversion and install High Sierra on HFS+ filesystem, or keep HFS+. With the final (17A365) version of High Sierra, such question is no longer displayed to people with systems on flash-only storage. During the installation of developer and beta versions of macOS High Sierra, user was asked if he/she wants to “upgrade file system to APFS”.
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