![]() If you want your Mac to start up again from the volume you just you erased, select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions.When done, quit Disk Utility to return to the utilities window.Optional: If you previously used Disk Utility to add internal volumes other than Macintosh HD, you can erase them individually using the same process.It should have your main hard drive, OS (C:) selected already. If this button isn't shown, click Erase instead. Select Your Main Hard Drive A window labeled Disk Cleanup: Drive Selection will pop up. Format: APFS or Mac OS Extended (Journaled), as recommended by Disk Utility.Click the Erase button in the toolbar, then enter the requested details:.Some NSA approved automatic degaussers can erase dozens of hard drives in an hour and cost tens of thousands of US dollars. Click OK if you’re ready to erase the drive and format it. After clicking Start, Windows will pop-up a warning message telling you that Formatting will erase ALL data on this disk. The screen should flicker off for a few seconds and then come back on with the drive now available to be selected.
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