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Since upgrading - macOS Catalina crashed on the upgrade and started again leaving me with two Macintosh HD
it then crashed again and left me with x3 Macintosh HD's and Macintosh Data x3
I now have Catalina and would like to reverse back to Mojave but don't have any space now because my disk is full of upgrades...... that I don't want
If I use Utility and hit erase then delete then reappear.... they are not partitions
You do not say what exact Mac /model /year /size /retina /touchbar is this
or
what exact macOS you were currently running before the upgrade?
If it were me I would boot to Internet Recovery or a bootable installer and use the Disk Utility to reformat the parent drive.
DiskUtility>View>Show All Devices. This will wipe the drive in total. Reformat as GUID/apfs and then quit Disk Utility.
From this same Revovery you can reinstall the macOS as new then restore your user data from Setup assistant or from a TimeMAchine backup.
Recovery: https://support.apple.com/en-us/HT204904
How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250
Boot clone https://discussions.apple.com/docs/DOC-10081
You do not say what exact Mac /model /year /size /retina /touchbar is this
or
what exact macOS you were currently running before the upgrade?
If it were me I would boot to Internet Recovery or a bootable installer and use the Disk Utility to reformat the parent drive.
DiskUtility>View>Show All Devices. This will wipe the drive in total. Reformat as GUID/apfs and then quit Disk Utility.
From this same Revovery you can reinstall the macOS as new then restore your user data from Setup assistant or from a TimeMAchine backup.
Recovery: https://support.apple.com/en-us/HT204904
How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250
Boot clone https://discussions.apple.com/docs/DOC-10081
I have x3 Macintosh HD's since Catalinas Upgrade (How can I delete them)
