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I want to factory reset my Macbook Air 2019 with MACOS Catalina v. 10.15.7 and I see a Macintosh HD and a Macintosh HD - Data. Do I need to erase both or just the Macintosh HD? I noticed that the "data disk" has much less storage space than the "HD original". I am trying to update my Macbook Air and it says it doesn't have enough storage space for the update. Thank you in advance for replying.
Hi,
If you want to perform a complete factory reset, you will have to erase the volume group.
See Apple's instruction for more information:
Use Disk Utility to erase an Intel-based Mac - Apple Support
Follow these instructions: What to do before you sell, give away, or trade in your Mac - Apple Support
Reset Macbook Air 2019
