Macintosh HD and Macintosh HD Data?

I have the same problem.

i don’t understand

Please help I have tried to reset and now I have no Macintosh

I have the same problem. Did you figure it out?

Why did you respond to me. I didn't address you.

I clicked on Mount, nothing happened...what next?

Thanks you Barney-15E, I appreciate your response.

I'm having the same problem. Have you found a solution?

I restored data after installing the OS after formatting the drive.

They clearly show up to me as separate drives, am I reading the picture wrong?\

I would just ignore the second drive. You can't write to it anyway.

It isn't correct, but I doubt it would cause any problems.

Interesting. Does one of the "Data Drives" have nothing in it and the other showing there is? At the Apple store we checked both of the Data volumes. 1 had material and the other was empty. So we just deleted the empty one and now Time Machine works well and haven't noticed any loss of data or any other malfunctions on the computer. BTW, the new 16" rocks.

I updated to Catalina and decided I didn't like it, so I restored from the last Mohave backup. It seems that both the Macintosh HD and the Macintosh HD - Data have the same amount of storage used, almost as if data files got stored into both internal storage hard drives. Like the information was doubled.

The Time Machine backup just backs up the file tree, not the operating system itself. When you downgrade you need to wipe the system disk, reformat it and install Mac OS. You can then restore your data from Time Machine. But Time Machine does not reformat the drive.

Well, I hope no one takes your advice. When you install Catalina all of your data is put into the Data partition, and only Catalina itself is in Macintosh HD (where it is write protected). So if you delete the data partition (Macintosh Data) you will delete all of your data.

And if you just delete the data partition the remaining space on the physical drive does not automatically get reassigned to the Macintosh HD partition; it becomes unusable space. To recover that space you need to undo the partitioning: https://support.apple.com/en-us/HT208496, then restore Time Machine.

Will a new installation do that for me?

Will it do what for you?

Reading up and educating yourself makes us who and what we are.

Installing OS X over a current OS install will simply install an OS over what you currently have. It does not automatically erase anything.

Unless you erase the drive, you will most likely have the same problem.

You do not need the app store for this because you are going to use recovery which means you will download whatever from Apple's servers directly.

Likewise, if you do happen to see two Macintosh HD Data volumes in Disk Utility, and you didn’t intentionally try to create a separate partition:

Open Disk Utility while logged into your user account, hit View > Show All Devices,

By “Volumes” you’ll see a plus and a minus symbol.

Click on each Macintosh HD Data volume, when the “-“ becomes clickable, that’s the volume you can delete, as you are not booted up from that volume, can safely remove it here.

Of course it’s always a good idea to backup before trying any steps like that, cheers.