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how to fix disk on a mac

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Last Modified: 2020-06-01
how can i fix disk on mac 2015 ? ive tried the diskutil command but not sure if im doing it correctly. i want to delete everything and create one partition so i can install mojave.123
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Commented:
Are you booted into Recovery mode?  You can't erase the disk while you're booted up in the OS.

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Commented:
Yes, I do boot in recovery mode and I cannot erase the disk I get an error
Eoin OSullivanConsultant
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Commented:
Select the Apple SSD icon and not the 'container disk one' and then press the ERASE icon

What format and settings are you choosing when trying to erase and format?

Author

Commented:
Mac os extended is the format.

I did what you say and I get the error.

Unmounting disk
Couldn't open device

Operation failed
Eoin OSullivanConsultant
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Commented:
It would appear you’re not truly booted from the recovery partition as you cannot uncounted the drive to reformat it

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Commented:
i tried to go to terminal and use the diskutil and was getting errors
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