You might be asked to enter your Apple ID. Otherwise, click Erase to erase just the selected volume. In that case, you should erase the volume group.

If you see an Erase Volume Group button, the volume you selected is part of a volume group.

Name: Type the name that you want the volume to have after you erase it.

The volume your Mac started up from is named Macintosh HD, unless you changed its name.

In the sidebar of Disk Utility, select the volume that you want to erase.

If you're not erasing the volume your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder.

If you want your Mac to be able to start up from the disk you erased, reinstall macOS on the disk.

Click Erase to begin erasing your disk and every container and volume within it.Disk Utility shows a compatible format by default. Format: Choose APFS or Mac OS Extended (Journaled).Name: Type the name that you want the disk to have after you erase it.Click Erase, then complete these items:.Select the disk that you want to erase.In this example, Apple SSD is the startup disk: The disk your Mac started up from is at the top of the list. The sidebar now shows your disks (devices) and any containers and volumes within them. Choose View > Show All Devices from the menu bar in Disk Utility.If you're not erasing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. Then select Disk Utility from the Utilities window and click Continue. The Rules of Resizing Understanding how resizing works in Disk Utility will go a long way toward helping you resize a volume without experiencing any loss of information. Information in this article applies to Disk Utility in macOS Catalina (10.15) through OS X El Capitan (10.11). Partitioning a Mac Sierra, El Capitan hard drive basically divides the storage devices into individual partitions, which are further listed as separate volumes under the Devices section in the Finder sidebar.

Scansnap software for mac el capitan