Two different Macintosh drives are there
I recently upgraded to Catalina, and after upgrading to it, my storage is full now, and theres a new partition 'Macintosh HD' which is using 10gb of storage.
MacBook Air
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This is normal for Catalina. macOS Catalina is the first Macintosh OS to create two separate volumes for the operating system files and your data files.
I really wouldn't try and mess around with or delete one of the volumes.
