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My 27" Fusion Drive suddenly ballooned in size. For some reason I accumulated 2.44 TB of
Untitled Data on Container disk2. How can I get rid of this without reformatting the Fusion Drive?
iMac 27″, macOS 10.15
You can tell TM to exclude folders, if that is what you want to do, but that still doesn't fully resolve why you have this "Untitled data" volume in the first place.
Again, if you already have recent backups, you may want to consider starting over and reinstalling macOS.
Ref: How to reinstall macOS - Apple Support
If I understand you correctly you accidentally copied the TM backup set to your Data volume. If that's the case, you should be able to locate it with the Finder, and then, delete it. What I can't tell is what doing that did to the original data on that volume. It either added itself or overwrote it.
If you can't delete it via Finder, then you will need to completely erase your Fusion Drive, and then, reinstall a fresh copy of macOS. This should create the appropriate APFS container & volumes on the Fusion Drive. You would then restore your apps/data from a TM backup. This time be careful to choose the correct volume to restore that data to.
This should not happen "automatically," without user intervention. By default, macOS on an APFS container will have two volumes: Macintosh HD & Macintosh HD - Data. This would be true for Fusion drives, as well. Something does not add up with the Disk Utility images you provided.
Regardless, please post a screen shot of the results of using the following command in the Terminal app:
Thanks for the screenshot of the results.
Ok, let's take a look.
So far, so good. Now let's look a little deeper at the APFS container: disk2
The key here is, other than the modified names, there doesn't appear to be anything wrong with your Fusion Drive. If you attempt to erase the "Untitled - Data - Data" volume, you will end up deleting all of your apps/data, and would have to restore them from a recent backup.
Yes, I did have renamed disk 2 when I had problems formatting the fusion drive.
The "Untitled Data" happened when I placed a Backup backupdb folder on the wrong external drive.
When I tried to delete it through Time Machine, it ejected and unmounted the drive.
I was able to retrieve all the data and loaded it on to the iMac, then erased the external drive, put all
the data (except the Backup backupdb) back on and than deleted the folder from the external drive
on the iMac. It seems that the backup from the external HD is the "Untitled Data" on disk 2.
Hopefully I explained the situation clearly.
Is there anything I can do to get rid of the Untitled Data?
If I were to make a Time Machine back up, would the Untitled Data on disk2 be included?
Here is the screen shot you asked for. Thanks.
I did delete the folder on the Mac, but it created the Untitled Data on disk2.
When I make a new Time Machine back up would I be able to exclude this?
Thank you for your help!
How to delete Untitled Data on a Fusion Drive
