What You Can't See Mac OS

Hold the option key down while booting, see if OS X appears and select it to boot from, then reset the StartupDisk in System Preferences again. If that doesn't work, I suspect a hosed GUID partiton table, backup what you can out of Windows to a external drive and disconnect. Big Sur compatibility. Big Sur is the latest version of macOS. It arrived on some Macs in November. Learn How to install Mac OSX El Capitan on vmware as a virtual machine.there is no doubt that apple's Mac OS is the great operating system with cool features.

Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by a product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.

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What You Can't See Mac OS