Disk Utility won't let me erase the HD

Question

How do i totally wipe my hard drive and reinstall Catalina if Disk Utility won't let me erase the HD

(it's just greyed out and not an option to click)

iMac 27″, macOS 11.1

Posted on Dec 30, 2020 10:27 AM

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Answer 1

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Answer 2

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Restart to your Recovery HD, open Disk Utility,

Click on View in the menubar and select Show All devices.

Highlight the Disk not any of the indented Volumes.

Click Erase.

Give the disk a name,

Format: APFS

Scheme: GUID Partition Map

Click Erase.

When Done quit Disk Utility.

Have you made a bootable USB installer for Catalina

before you go ahead and erase your Big Sur install.

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