![]() ![]() ![]() As of writing, Fusion Drive doesn't support APFS, but Apple says that this will change soon. The startosinstall utility also allows you to force an APFS conversion, except for those storage disks that don't support the new file system. Once done, your Mac will reboot and the actual installation process starts without converting the existing HFS files system to APFS.Īfter the upgrade is complete, you can always check whether the startup drive has been converted or not. You'll then see Terminal counting up to one hundred (representing a percentage) as it copies over the files that the installer needs. Accept the macOS High Sierra license terms by entering a capital “A” at the prompt.Enter the administrator password if prompted, and hit the return key. Press enter, and start the upgrade process.Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/startosinstall –converttoapfs NO Download the macOS High Sierra installer app from the App Store. ![]() This utility will help you skip the APFS conversion faster than the first method, since the command line you'll enter into Terminal will instruct the installer to skip that specific step, eliminating the need to create a clone and move it to another drive. Unpacking the macOS High Sierra installer will unveil many ‘secrets’ that Apple is hiding away from the average user, and the startosinstall is just one of them. Even Disk Utility's Restore feature can be of great help here. After finishing the upgrade use cloning software such as Carbon Copy Cloner to create an exact copy of the external drive on the internal drive. Apple's new file system currently supports internal SSDs for automatic APFS conversion, so even if the drive is an SSD the external volume won't be converted, as such the existing formatting of the drive is retained during the installation process. Use an external drive as the target for the macOS High Sierra install. How to Prevent Automatic Conversion to APFS Use an External Volume There are two methods to avoid the process, and we don't recommend doing so at all, especially not if you’re a novice Mac user, but if you are determined to stop the HFS to APFS conversion, then use one of the options described below. If your Mac startup drive meets the criteria, the conversion to APFS is – theoretically – unstoppable, but there are still ways of skipping the conversion process, ensuring the SSD remains in the older HFS format. APFS brings improvements to speed and also comes with strong support for encryption since it was built with encryption at its core, but you may have your own reasons for preserving the old file system – maybe you don't use Time Machine and want the data intact on the internal volume. Why Skip APFS?įusion Drives and traditional hard disk drives (HDDs) aren't converted during the installation process for macOS High Sierra, just like any non-Mac volumes, but SSDs are. And so if you don't want the SSD to be converted into APFS, there is a way to stop the process. But there is one thing that the tech giant forgot about: the developer community, which always quickly reacts to this sort of news with a workaround. Apple doesn't require your consent: want it or not, the HFS volume is converted to APFS, a transition that you cannot stop – at least according to Apple. That gave me conflicting reports each restart but did inform me on one restart that ~100 GB of data was purgeable.When you install macOS High Sierra with flash storage, that volume is automatically converted to the all-new APFS (Apple File System). You can also look at the built in Disk Utility. The directory has restrictive permissions, so I assume that was the culprit.ĭeleting that directory isn't harmful to the system as far as I know, and it regenerates when the OS needs it again. Daisy Disk, however, did find a glob of ~75 GB that it couldn't scan because of permissions, even when scanning as admin. Now my System section is 50 GB (used to be 120 GB).ĭisk Inventory X gave me different sizes than the System Information window and it didn't find any problematically large files. The system couldn't read the size of the directory so I figured it was a problem folder, so I deleted it, emptied the garbage, and restarted. I read an answer somewhere to an issue related to this that I could delete the folder in /System/Library/Caches/. I restarted a few times and nothing seemed to happen. One night the size of the 'System' section of my storage increased 40 GB in an hour (though, I am running the High Sierra Beta). I believe that when I got my MBP, the size was around 16 GB. ![]()
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