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What is erasing disk?
Data erasure (sometimes referred to as data clearing, data wiping, or data destruction) is a software-based method of overwriting the data that aims to completely destroy all electronic data residing on a hard disk drive or other digital media by using zeros and ones to overwrite data onto all sectors of the device.
Does erasing Macintosh HD delete everything?
Erasing your Mac permanently deletes the files on it. If you want to restore your Mac to its factory settings, for example when you want to prepare it for a new owner, first find out what to do before you sell, give away or trade in your Mac.
What happens if you erase your disk?
Erasing your hard drive also removes all computer software installed on it, including things like word processors, Web browsers, games and email applications. To use such programs in the future, you will have to reinstall them from discs or download them from the Internet again.
Does erasing a hard drive delete everything?
To wipe a hard drive means to completely erase the drive of all its information. Deleting everything does not wipe a hard drive and formatting does not usually either. If you want to make sure that your private information is gone forever, you’ll need to wipe the hard drive using special software.
Can a clean re-install change the system volume?
The first of those is the read-only System volume, and the second the read-write Data volume. Because you want to re-install macOS, the logical thing to do would be to wipe the System volume, which suggests that you could get away with retaining your own files on the Data volume through a clean re-install. Sadly, that’s wrong and will fail.
How do I erase a volume on my MacBook Pro?
In the Recovery app window, select Disk Utility, then click Continue. In Disk Utility, select the volume you want to erase in the sidebar, then click Erase in the toolbar. Type a name for the volume in the Name field, click the Format pop-up menu and choose APFS, then click Erase Volume Group.
Do you need to erase disk before installing high Sierra?
If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files. Click to expand…
What to do if you cant erase a disk on a Mac?
If you don’t see it there, choose Apple menu > Shut Down, then unplug all nonessential devices from your Mac and try again. If your disk still doesn’t appear in Disk Utility, or Disk Utility reports that the erase process failed, your Mac might need service. If you need help, please contact Apple Support.