Hi hope someone can help me, I recently got a new Mac and updated to Big Sur. A programme I use was not compatible with Big Sur so I followed a YouTube video on how to downgrade back to Catalina. In doing so I have managed to create a partition which I can not delete. Also had an issue reinstalling Catalina and now 'Macintosh HD - Data' is duplicated. Anyone know how I can remove these?
MacBook Pro 16″, macOS 10.15
Partitions are physically separate areas on the disk, whereas Volumes can exist in the same space. When you install Big Sur, start with a Container and one volume. You can't delete the partition you are in at the time.
Make a backup of your data volume on an external SSD. Direct copying to another computer may be the only way left to you.
The Installer makes a second volume, as you have now seen for yourself. Use Disk Utility to format APFS (unencrypted at this stage). You can delete extra volumes using the +/- icons. But don't do this until you have got the backup copy of your data from it.
Hi, thanks for replying. I already tried this method. The delete (-) option is greyed out and I am unable to select the partition and delete (-). Any other options?
Boot your Mac into recovery mode. Then use Disk Utility while in recovery mode to delete the partitions. Then create a new one and install Catalina in your newly created partition. That's how I would do it.
Hi,
Just create un new volume in disk utility ( with name , ex MacOS10) And install catalina on this disk.
You will have the 2 OS sharing the same disk. Boot with option key for OS changing .
How do I delete Partition?
