Apple also offers Shift-Command-Option-R, which installs the version of OS X or macOS with which your computer shipped, or the next oldest compatible system still available for download.
Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away, or trading in your Mac, you should erase your entire disk.
Erasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.
Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.
How to erase your disk
How to erase a volume on your disk
Reasons to erase
You can erase at any time, including in circumstances such as these:
About APFS and Mac OS Extended
Disk Utility in macOS High Sierra or later can erase using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.
![]() How to choose between APFS and Mac OS Extended
Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can't, it chooses Mac OS Extended, which works with all versions of macOS. If you want to change the format, answer these questions:
How to identify the format currently in use
If you want to know which format is currently in use, use any of these methods:
If your disk or volume doesn't appear, or the erase fails
Learn more
If you've encountered a problem with macOS, the solution might be to reinstall the system on your Mac. This can be done by any Mac owner, but it can be a little bit complicated. You'll need to put your Mac into macOS Recovery, which gives you tools to diagnose problems on your Mac, as well as reinstall the operating system.
Here's how to reinstall macOS using Recovery mode.
Entering macOS Recovery
macOS Recovery has tools at its disposal that allow you to diagnose problems with your Mac's hard drive, reinstall macOS, and restore from a Time Machine backup. You can enter Recovery by pressing certain key combinations. The combination you choose will determine which version of macOS will be installed on your system when you select Reinstall macOS.
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How to check your startup disk with Disk Utility in macOS Recovery mode
The first thing you'll want to do is make sure your Mac's startup disk is healthy. You'll need to use Disk Utility to do that.
How to erase your startup disk in macOS Recovery mode
If you need to start completely fresh, then you'll want to erase your startup disk using Disk Utility. If you want the content on your Mac to stay intact, skip to the next section.
How to reinstall macOS while in Recovery mode
The next step is to reinstall macOS.
Your Mac will now go through the normal macOS installation process, eventually restarting. If you're starting from scratch, you'll need to set up your Mac from scratch.
Os X Base System EraseQuestions?
If you have any more questions about reinstalling macOS on your Mac, let us know in the comments.
In full-screen mode virtual keyboard automatically resizes to fit the width of the screen when invoked. Change size, color and transparency of keyboard on the computer screen.You can change size, color and transparency of keyboard with one click at any time. Also Free Virtual Keyboard allows people with mobility impairments to type data by using a pointing device.Free Virtual Keyboard comes with 4 different virtual keyboards and supports all languages and keyboard layouts installed in the system. Os-x use virtual keyboard for security. This means it works in both landscape and portrait orientation, something other keyboard does not do.
Updated December 2019: Everything is up to date through macOS Catalina.
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