What does erasing disk on Mac do?

In Disk Utility on Mac, you can erase and reformat storage devices to use with your Mac. Erasing a storage device deletes everything on it. If you have any files you want to save, copy them to another storage device.

How do I wipe my Mac hard drive completely?

How to Wipe a Mac With an M1 Chip

Turn on your Mac and continue to press and hold the power button until the startup options window comes up.
When the Utilities window appears, select Disk Utility.
In the sidebar, choose Macintosh HD.
Click the “Erase” button, then select a file system format and enter a name for it.

How do I wipe my MacBook Pro Clean to sell?

Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. Release the keys after about 20 seconds. This clears user settings from memory and restores certain security features that might have been altered.

Do I delete Macintosh HD or Macintosh HD data?

To perform a clean re-install in Catalina, once in Recovery Mode, you need to delete your Data volume, that’s the one named Macintosh HD – Data , or something similar if you’re using a custom name, and to erase your System volume.

Does macOS reinstall delete data?

2 Answers. Reinstalling macOS from the recovery menu does not erase your data. However, if there is a corruption issue, your data may be corrupted as well, its really hard to tell.

Does reinstall macOS erase data?

You can erase your Mac and use macOS Recovery, the built-in recovery system on your Mac, to reinstall macOS. WARNING: Erasing your Mac removes all the information from it. Before you start, back up your Mac with Time Machine.

How do I force my Mac to unmount disk?

For that using the terminal application again, enter the following command: sudo diskutil unmount force /dev/(enter here disk identifier name) Then press return and enter the admin password if prompted. This will definetely unmount the entire disk and all its related volume.

Can you factory reset a MacBook pro?

Choose Apple menu > Restart, then immediately press and hold Command-R. 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.