If the macOS installer says that some features of macOS are not supported for the disk

The installer might say that some features aren't supported for the disk, and that some features won't be available.

If the macOS installer can't create a recovery system on your disk, it allows you to continue the installation, but warns that some macOS features won't be available. That can happen in these circumstances:

  • You're installing macOS on a RAID volume
  • You're installing macOS on a disk that contains a nonstandard Boot Camp partition: a partition that was manually modified outside of Boot Camp Assistant or was added after using Boot Camp Assistant.

You don't need a recovery system to install and use macOS, but without it you can't use FileVault, set up a firmware password, or use Disk Utility to repair the disk. 

If you're installing on a RAID volume

If you want to use the features enabled by a recovery system, install macOS on a disk that isn't a RAID volume, and use that disk as your startup disk.

If your disk has a nonstandard Boot Camp partition

If you want to use the features enabled by a recovery system, erase the disk before installing macOS:

  1. Make sure that you have a backup of your disk, including the Boot Camp partition. Time Machine doesn't back up Boot Camp partitions. 
  2. Start up from macOS Recovery over the Internet*: Hold down Command-R on your keyboard immediately after pressing the power button to turn on your Mac, or immediately after your Mac begins to restart. Continue holding until you see the spinning globe. 
  3. Follow the remaining steps to reinstall macOS, including the steps for erasing your disk.
  4. Use Boot Camp Assistant to create a new Boot Camp partition. Then restore the data from the backup of your previous partition.

* If you can't start up from macOS Recovery over the Internet, use an external startup disk instead.

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