After upgrading to Catalina I am getting this error from the Time Machine backup app:
"Two os the disks to back up to have the same name. Rename one of the disks named "Macintosh HD-Data". Does anyone have an idea why this is happening and how to correct this error to get ™ working again? Thanks!
Thank you BDAquq, just the last confirmation I needed! I saw that one of the Macintosh HD - Data disks had the House icon and I also tested that that was the one, where newly created user files go. It is the ‘hidden’ volume in Macintosh HD - Systems.
I found also that I had to do something - not only because of the impact on Time Machine: as the system is confused, some of the newly installed applications landed in the additional, wrong partition! And then of course, don’t show up in Finder Applications, even though functional. And the iCloud Drive backup (when I turned it off) also ended up in the wrong partition.
So I moved the data that were created there since upgrade to my Desktop. Apart from the Applications, as that will not work. Then I unmounted (and therefore erased) the additional volume without the House icon for the user folder with the Disk Utility. Installed all lost applications again and all is working fine as far as I can tell, including Time Machine and all Applications, showing up in Finder.
Point of fact, updating to 10.15.1 does *not* correct this problem. I am on 10.15.1 and this problem persists.
I had the same problem, tried your solution, and it seems to work without any ill effects to far :)
This is very confusing -- it appears that you do have two logical volumes named "Macintosh HD - Data" - one is only 250.9MB (named disk3s1 and one is 185.7GB named disk3s5 on the 550GB APFS container that is physically on the 1TB internal drive -- perhaps you had to try two different times to install Catalina? Sorry, but i've no idea how to untangle your situation, but if I figure something out will post later. Sorry...perhaps someone with APFS expertise can give advice on how this might have happened and how to untangle it.
However the output you posted didn't show the commands you used -- that would help to see the command you typed and the output it produced, plus the list of drives seems incomplete as there is no disk4 or disk5 device shown on the "diskutil list" command but they are listed on the "df" command so it's very confusing to see inconsistent info like this.
Good luck...
I have a similar problem: Here are my disk outputs...
Disk3 below is my external Time Machine Drive.
]% df -kt
Filesystem 1024-blocks Used Available Capacity iused ifree %iused Mounted on
/dev/disk1s5 976797816 10839840 250313420 5% 481895 9767496265 0% /
devfs 201 201 0 100% 698 0 100% /dev
/dev/disk1s1 976797816 711699596 250313420 74% 4121814 9763856346 0% /System/Volumes/Data
/dev/disk1s4 976797816 3146812 250313420 2% 4 9767978156 0% /private/var/vm
map auto_home 0 0 0 100% 0 0 100% /System/Volumes/Data/home
/dev/disk2s2 4883303600 3909763256 973540344 81% 37437533 4257529746 1% /Volumes/Time Machine
/dev/disk3s2 4883303600 3907452296 975851304 81% 37436668 4257530611 1% /Volumes/Time Machine 1
% diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 314.6 MB disk0s1
2: Apple_APFS Container disk1 1.0 TB disk0s2
/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +1.0 TB disk1
Physical Store disk0s2
1: APFS Volume Mandrenke HD - Data 728.8 GB disk1s1
2: APFS Volume Preboot 80.5 MB disk1s2
3: APFS Volume Recovery 528.9 MB disk1s3
4: APFS Volume VM 3.2 GB disk1s4
5: APFS Volume Mandrenke HD 11.1 GB disk1s5
/dev/disk3 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *5.0 TB disk3
1: EFI EFI 209.7 MB disk3s1
2: Apple_HFS Time Machine 5.0 TB disk3s2
% tmutil latestbackup
/Volumes/Time Machine 1/Backups.backupdb/mandrenke/2019-10-11-141213
You should post another question rather than piggy back onto this one -- your situation is different than OP. Don't want to confuse other people when I make a suggestion to solve your problem as it's not at all gonna address the problem with having two "Machintosh HD - Data" partitions. There are already two threads running in this discussion that don't have anything to do with each other, don't want to make it three.
But I will make one suggestion for you -- reboot your system in safe mode and then again in normal mode. And post back a new question if it's still a problem.
Good luck...
Just has this problem, and took the rash decision to delete and erase the smaller duplicate. Time will tell if it worked: if the worst comes to the worst, I'll reboot and resinstall from my CC+ clone and try again.
Brian
As I appeared to have two instances of "Macintosh HD [Data]", and had recently made a complete bootable clone of my mac with Carbon Copy Cloner (and tested it!), opened Disk Utility and zapped the smaller of the two mirrored drives.
Everything seems to be working perfectly, and Time Machine is functioning once more.
Brian
Thanks! Please let me know if you found an issue with tis step.
Time Machine error with Catalina