Should the MacOS volume under container disk 2

A Container under APFS is much like a Partition on other file systems. However, you don't get any option to name the Container. They are created sequentially. If you erase an APFS drive, the newly created file system will create a sequentially named Container, not Container 1.

Within the Container are Volumes which all share the storage space of the parent container. You can set disk quotas on the Volumes when you create them, but otherwise they all share the same storage space.

The two unmounted volumes are Preboot and Recovery. They do not need to be mounted unless they are being used (i.e. booting or Recovery).

I worry about this because I messed up around the disk partition stuff couple hours ago. And just have it fixed.

Container disk1 must have gotten renamed at some point, after a reinstall from Recovery would be my guess(?) or in deleting a partition. Named disk2—the next available disk number.

No harm. Looks fine. The numbering system is relative— does not have to be sequential in your case.

macOS Sierra: Delete Your APFS Partition the Right Way - The Mac Observer

DoesITMatterBro wrote:

Do you know if there would be any way to have it rename back to disk1?

As mention above "you don't get any option to name the Container"

For what ever reason this would be important to you (?),

yes You can always erase/reformat the disk and set back up as new install.

Boot into Internet Recovery or from a bootable USBinstaller and use the Disk Utility.

Verify fro DU>View>Show all Devices and erase/reformat the parent Device.

Recovery http://support.apple.com/kb/HT4718

How to create a bootable installer for macOS - Apple Support

FWIW...

When I upgraded my 2014 Mac mini, that has a Fusion drive, to Mojave, my system drive appears in the disk3 container. that's because my external WD My Book Pro was assigned to disk0 and the Fusion SSD & HDD drives were assigned disk1 & disk2 respectively. If I disconnect the external drive, the assignments change.

Do you mean I should just back up everything, then format the disk, and set up a new disk which should automatically name by order which in this case is disk1?

There is no reason that it would necessarily make it disk1. You're chasing your tail all the way down a rabbit hole.

DoesITMatterBro wrote:

Do you know if there would be any way to have it rename back to disk1?

Why? The name of the disk is irrelevant.