Two Data Disks

[SPJones]

Hi, I've searched for previous posts on this and can't find an exact match. Hopefully you guys can help!?

Since reinstalling Catalina on my Late 2012 iMac after having a previously patched version of Monterey on it, I now have two "Macintosh - Data" locations when I open Disk Utility. One has the little house symbol on it, the other doesn't, and both have very similar (30GB) used capacity.

My question is; is this normal? And if not, how do I go about rectifying it?

Thanks!

 

[gilby101]

It easily done when mixing macOS installs and desirable to fix it.

Please provide the output from the Terminal command: diskutil list

 

[SPJones]

It easily done when mixing macOS installs and desirable to fix it.

Please provide the output from the Terminal command: diskutil list

Hi @gilby101 thanks for replying.

I think, following a further browse of the Apple help pages, that I've managed to solve it and have now deleted the unneeded 'extra' Data partition.

However, I've now run the terminal command and have this output:
/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *480.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_APFS Container disk1 479.9 GB disk0s2



/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +479.9 GB disk1

Physical Store disk0s2

1: APFS Volume Macintosh 11.3 GB disk1s1

2: APFS Volume Preboot 82.4 MB disk1s2

3: APFS Volume Recovery 530.0 MB disk1s3

4: APFS Volume VM 3.2 GB disk1s4

5: APFS Volume 16.0 GB disk1s5

6: APFS Volume Macintosh - Data 32.6 GB disk1s8


Would any of the above necessitate further 'tidying up' of the volumes? Thanks!

 

[gilby101]

Here is what mine (macOS 12.5.1) looks like (a more vanilla configuration without any volume changes since installation of macOS):
/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +500.0 GB disk1
Physical Store disk0s2
1: APFS Volume BethSSD - Data 281.1 GB disk1s1
2: APFS Volume Preboot 890.1 MB disk1s2
3: APFS Volume Recovery 1.1 GB disk1s3
4: APFS Volume VM 4.3 GB disk1s4
5: APFS Volume BethSSD 15.4 GB disk1s5
6: APFS Snapshot com.apple.os.update-... 15.4 GB disk1s5s1

With Catalina, I would not expect the snapshot (volume 6 in mine). So the only thing which is a little odd is your volume 5 - unnamed 16GB disk1s5. It can probably be removed, but don't rush to do so. Can it be mounted in Disk Utility?

 

[SPJones]

Here is what mine (macOS 12.5.1) looks like (a more vanilla configuration without any volume changes since installation of macOS):
/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +500.0 GB disk1
Physical Store disk0s2
1: APFS Volume BethSSD - Data 281.1 GB disk1s1
2: APFS Volume Preboot 890.1 MB disk1s2
3: APFS Volume Recovery 1.1 GB disk1s3
4: APFS Volume VM 4.3 GB disk1s4
5: APFS Volume BethSSD 15.4 GB disk1s5
6: APFS Snapshot com.apple.os.update-... 15.4 GB disk1s5s1

With Catalina, I would not expect the snapshot (volume 6 in mine). So the only thing which is a little odd is your volume 5 - unnamed 16GB disk1s5. It can probably be removed, but don't rush to do so. Can it be mounted in Disk Utility?

Thanks. It was unmountable, so I erased it and now everything looks 'normal' (or as normal as it does to someone who understands about 20% of all this!). Thanks again.