![]() 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.If this button isn't shown, click Erase instead. Format: APFS or Mac OS Extended (Journaled), as recommended by Disk Utility. ![]() Click the Erase button in the toolbar, then enter the requested details:.On the Confirm Erasure dialog box appears, click Confirm Erase. Select the volume to erase unused space, then click Erase. ![]() Launch the tool and from the ' Select What To Erase ' screen, toggle on Unused Space, then click Next. DRIVE should be changed to the name of your hard drive. 0 is a single-pass run of zeroes 1 is a single-pass run of random numbers 2 is a 7-pass erase 3 is a 35-pass erase and 4 is a 3-pass erase. ![]() You’ll need to change VALUE to a number between 0 and 4.
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