I upgraded form Mojave to Monterey. Several hours later, somehow a second Macintosh HD is mounted. It's not the Macintosh Data volume, simply a second Macintosh volume.
The Volume mounted first appears to be the main volume. The second volume only has about 15GB of data.
Is it safe to delete the volume mounted second with 15GB of data.
See Link to screenshot below showing the second volume does not say Data.
I can refine the screenshot if needed.
It would be better if you could just post it here. Use the Image button in the toolbar.
It does appear you have managed to create two Macintosh HD volumes. Since the snapshot is made from disk2s7, that would be the actual system volume. It may be as simple as selecting the unused one and removing it in Disk Utility. It will be the one that does not have the snapshot under it.
I can refine the screenshot if needed.
It would be better if you could just post it here. Use the Image button in the toolbar.
It does appear you have managed to create two Macintosh HD volumes. Since the snapshot is made from disk2s7, that would be the actual system volume. It may be as simple as selecting the unused one and removing it in Disk Utility. It will be the one that does not have the snapshot under it.
That’s odd. It does look like an aborted install.
I would say you could select the one that is alone and click the Remove Volume button.
I just wanted to make sure you weren’t booted into the “other” OS, which you cannot be because it is missing the rest of the components.
To add - really suggest getting not DU and View >> View All Devices.
Look at each Macintosh HD and watch for the / Mount Point / Should one appear a /System that one ids to Keep. If one reads /Volume - that one maybe a leftover from a previous aborted update / upgrade.
Be very careful and perhaps a screen shot of each Macintosh HD showing there respective mount points.
Open the Terminal app and run this command
sudo diskutil list
This will provide info n the disks
Do you have another OS version installed on that Macintosh HD. It could be Mojave or Catalina. Based on the size I would say Catalina.
If you open Startup Disk System Prefs, do you have more than one startup disk option?
Tend to agree with @Barney-15E.
To be safe before attempting Run a TM Backup
The Volume mounted 2nd: The Applications, Library and Users Folder appear to be empty. The only files are in the System folder.
From the Terminal:
Last login: Tue Dec 7 23:11:28 on console
The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.apple.com/kb/HT208050.
iMac-27-5K:~ joegramm$ sudo diskutil list
Password:
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *2.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_APFS Container disk2 2.0 TB disk0s2
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_APFS Container disk2 121.1 GB disk1s2
/dev/disk2 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +2.1 TB disk2
Physical Stores disk1s2, disk0s2
1: APFS Volume Macintosh HD - Data 857.4 GB disk2s1
2: APFS Volume Preboot 269.9 MB disk2s2
3: APFS Volume Recovery 1.1 GB disk2s3
4: APFS Volume VM 14.0 GB disk2s4
5: APFS Volume Macintosh HD 15.7 GB disk2s5
6: APFS Volume Macintosh HD 15.7 GB disk2s7
7: APFS Snapshot com.apple.os.update-... 15.7 GB disk2s7s1
/dev/disk3 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *4.0 TB disk3
1: EFI EFI 209.7 MB disk3s1
2: Apple_HFS Time Machine 4.0 TB disk3s2
/dev/disk4 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *4.0 TB disk4
1: EFI EFI 209.7 MB disk4s1
2: Apple_APFS Container disk5 4.0 TB disk4s2
3: Apple_Boot Boot OS X 650.0 MB disk4s3
(free space) 135.1 MB -
/dev/disk5 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +4.0 TB disk5
Physical Store disk4s2
1: APFS Volume Mac HD Clone 766.0 GB disk5s1
2: APFS Volume PreBoot 42.2 MB disk5s2
3: APFS Volume Recovery 521.8 MB disk5s3
iMac-27-5K:~ joegramm$
Yep, that’s the one, but I’m not sure if you need to select that one or the indented one underneath. The one underneath is the actual volume, and the one that says “volumes” is just a for grouping everything in the volume group.
It’s a new display, so I’m not sure if it lets you choose either.
I would try the volume group, first, to see what happens, but if the – button is gray, select the actual volume.
Sorry to keep asking because it seems obvious it's the volume with only 15.69 GB.
So, this one:
Not sure how to follow your suggestions. Is that an app or command??
For reference, I did attempt an upgrade previous to this. Somehow after the upgrade I was missing around 300 GB on the HD. I tried restoring back to Mojave with my CCC clone and that would not work. So I went into Recovery Mode and reverted back to Mojave via Time Machine.
Updated Screenshot showing DU/Show Only Volumes. It's bit confusing because the top level Macintosh HD mounted on the desktop appears to be the active System Volume.
In DU, the top level volume appears to be the unused volume.
So just to be absolutely clear, in DU, the volume I would be deleting is the Macintosh HD volume at the top level. Opposite of my actual Desktop. Hope that makes sense.
I do not have another OS installed on the other Macintosh HD. The only other place I have an OS installed is on my Mac HD Clone which has Mojave on an External USB drive. Then Time Machine on an external USB drive. The clone is currently not mounted that's why it's not in Startup Disk.
When I installed Monterey for the second time the drive was not there initially. Only after hours of running Monterey did it show up. In that time I was updating Music and Apple TV Libraries, etc.
Other than the potential of the bad first install causing the second volume, I did something I never do. In Mojave while Monterey was downloading, near the end of the download I quickly opened up Disk Utility to check the disk usage so I could compare it in Monterey. Could that have possibly interrupted the install and created a partial volume..
Please keep in mind my last OS install was Mojave and I'm a little rusty..
Thank you for the handholding on this. A pretty scary prospect to delete anything called the "Macintosh HD".
I deleted the volume under the Macintosh Group and all seems fine. I re-started the computer and it booted up as expected.
Available Disk space went from 1.22 TB > 1.27 TB
Would there be any benefit to boot into Recovery and repair the disk.
Updated Version of DU & System Report/Software
Ah - suspected there was an Aborted or TM Backup used to Restore to previous version of macOS.
Pardon the Squiggle. I tied to correct a mis-type
2 Macintosh HD
