Deleting everything does not wipe a hard drive and formatting does not usually. Earlier versions of macOS: Choose Apple menu > About This Mac, then click Storage. macOS Ventura or later: Choose Apple menu > System Settings, click General in the sidebar, then click Storage on the right. 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. To wipe a hard drive means to completely erase the drive of all its information. As you take the steps in this article to free up storage space, this storage information updates automatically.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:.Select Macintosh HD in the sidebar of Disk Utility.Since the OS can't see the data, the drive looks empty when you look at its contents. It typically targets temporary files, files sitting in a computer’s Downloads folder, and items in the Trash or Recycle Bin for permanent deletion. To do this successfully: Click the Start button from your desktop. A common way to 'erase' data is to format the hard drive, but you don't actually erase the drive of its data when you do this, but instead only erase the location information for the data, making it 'lost' to the operating system. What is Disk Cleanup Software Disk cleanup software aims to improve a computer’s functionality by removing old and unnecessary files that slow down the computer’s processing. Get control of your storage space by deleting unused applications that take up space. From the utilities window, select Disk Utility and click Continue. Uninstall unnecessary apps and programs Just because you’re not actively using an outdated app doesn’t mean it’s still not hanging around.If asked, select a user you know the password for, then enter their administrator password.Start up from macOS Recovery: Turn on your Mac, then immediately press and hold these two keys until you see an Apple logo or other image: Command (⌘) and R.
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