Hard drive suddenly unformatted, can’t get macOS to load

I just updated my machine with the latest update. After restarting my iMac keeps loading windows through boot camp. I can’t get into my Mac. When I look at the hard drive using disk utility, there is 1.7TB that is unformatted while the other 300 is for windows.

Does anyone know how to fix this? I ran first aid repair and it was completed without any errors.

iMac 27″, macOS 11.6

Posted on Oct 18, 2021 02:04 PM

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1 reply

karina184

Community Specialist

Oct 19, 2021 11:03 AM in response to desiplaya

Hi desiplaya,

It sounds like you need some starting your Mac and we can help.

Try taking the steps to choose your startup disk here:

Change your Mac startup disk

Let us know what happens.

Thanks for using the Apple Support Communities.

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Hard drive suddenly unformatted, can’t get macOS to load

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