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Level 1

4 points

what is macOS Base System

to erase an imac. do i also have to erase macOS Base System?

MacBook Pro 13″, macOS 11.2

Posted on Feb 4, 2021 1:43 PM

Top-ranking reply

Level 8

46,092 points

Posted on Feb 4, 2021 2:02 PM

No. Here is my guide:

Once you are in macOS Recovery, verify you are connected to WiFi in the top right corner.
Go to Disk Utility.
Select "View" in the toolbar > "Show All Devices".
Select your main hard drive. This will either be "APPLE SSD...", "APPLE HDD...", or "Fusion Drive". DO NOT select Base System.
Click Erase, and input the following exactly:
Name: Macintosh HD
Format: APFS
Scheme: GUID Partition Map
Click Erase (THIS WILL ERASE ALL DATA)
Quit Disk Utility
Go to the reinstall macOS app.
Follow the prompts, and install on Macintosh HD.

Cheers,

Jack

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