MacBook Air 2015 won't boot after erasing, Disk Utility shows SSD and OS X Base System

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MacBook Air 2015 won't boot after erasing, Disk Utility shows SSD and OS X Base System

Hi all, I’ve been following the instructions for erasing my MacBook Air (2015) and now I can start it only in a recovery mode, otherwise a folder with a question mark shows when I turn it on. I can’t reinstall the OS because the drives for it aren’t showing. When I go to Disk Utility I can see the SSD Disk and the OS X Base System and running the First Aid suggests they’re fine. I have no idea what to do and I’m stuck. Please help!

[Edited by Moderator]

Original Title: Disk Utility

MacBook Air 13″, macOS 12.6

Posted on Jun 20, 2025 01:59 AM

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Answer 1

HWTech

Level 9

66,758 points

Jun 20, 2025 09:32 AM in response to RS_rs_RS

In the second photo where you have highlighted the "251 GB Apple SSD SM..." item and click the "partition" tab on the right pane. Select "1 partition" making sure it is "GUID partition" and select the "MacOS Extended (Journaled)" file system. See the following article:

https://eshop.macsales.com/manuals/mac-formatting-guide-legacy-covers-disk-utility-for-os-x-10-6-10-10

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MacBook Air 2015 won't boot after erasing, Disk Utility shows SSD and OS X Base System

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