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My mid-2012 Pro will not boot correctly anymore.
I cannot boot to recovery mode or internet recovery mode.
If I create a bootable USB and reinstall Catalina from there, will it erase my hard drive or will it only replace the MacOS system files? Thanks.
MacBook Pro 15″, macOS 10.15
BrandonW83 wrote:
My mid-2012 Pro will not boot correctly anymore.
I cannot boot to recovery mode or internet recovery mode.
If I create a bootable USB and reinstall Catalina from there, will it erase my hard drive or will it only replace the MacOS system files? Thanks.
Boot from your USBinstaller and from Disk Utility
the dropdown menu: Utilities> Disk Utility> run the First Aid on your Macintosh HD (and the "Macintosh HD-Data" volume as well if Catalina/Big Sur) If errors are found and repaired, run again until no errors reported.
Disk Utility>View>Show All Devices The best sequence is —
• Volume level
• Container level
• Parent drive
You should still see your Disk structure on the internal—if it is still intact
How to repair a Mac disk with Disk Utility https://support.apple.com/en-us/HT210898
How to erase a disk for Mac - https://support.apple.com/en-us/HT208496
How to reinstall macOS from macOS Recovery - https://support.apple.com/en-us/HT204904
BrandonW83 wrote:
My mid-2012 Pro will not boot correctly anymore.
I cannot boot to recovery mode or internet recovery mode.
If I create a bootable USB and reinstall Catalina from there, will it erase my hard drive or will it only replace the MacOS system files? Thanks.
Boot from your USBinstaller and from Disk Utility
the dropdown menu: Utilities> Disk Utility> run the First Aid on your Macintosh HD (and the "Macintosh HD-Data" volume as well if Catalina/Big Sur) If errors are found and repaired, run again until no errors reported.
Disk Utility>View>Show All Devices The best sequence is —
• Volume level
• Container level
• Parent drive
You should still see your Disk structure on the internal—if it is still intact
How to repair a Mac disk with Disk Utility https://support.apple.com/en-us/HT210898
How to erase a disk for Mac - https://support.apple.com/en-us/HT208496
How to reinstall macOS from macOS Recovery - https://support.apple.com/en-us/HT204904
It will only erase your mac if you tell it to from Disk Utility.
If you choose Install OS from the Utilities panel when you
boot to the installer it will overwrite your system files your
personal files and apps etc will be fine.
But you must make a full back up before reinstalling.
Will installing from a Bootable USB erase my hard drive?
