Too large Other Volume in Container My Mac show disk full and realized that I can use only 100 GB (Out of 500 GB).
I checked Storage and realized that there are a lot of space for &quot;Other Volume in Container&quot;.

So I check diskutil list in terminal and found below

I know APFS Volume disk1s5 and disk1s6 but I am not sure what is disk1s1.
It is not visualized it in DiskUtil also. Does someone know how to increase available volume?
Or how to delete that disk1s1 volume?
Below is the command result from &quot;diskutil apfs list&quot;

Thank you!
Multiple &quot;Macintosh HD - Data&quot; is a sure sign that Catalina has been installed more than once without erasing the whole physical disk.
You may be able to fix it by:

Backup all your data and settings to Time Machine (in case something goes wrong).
Discover using &quot;diskutil apfs list&quot; which of disk1s5 and disk1s6 is  mounted.
Boot into Recovery mode (reboot holding Cmd-R down).
Using Disk Utility, delete all but one of the multiple Data disks.  Keep only the one which was mounted in step 2.
Reboot as normal.
If this works, all good.  If not use the Second Way below.

Second Way:

Backup all your data and settings to Time Machine - this is essential.
Boot into Recovery mode (reboot holding Cmd-R down).
In Disk Utility make sure you can see all physical disks.  Do this by using the menu View and Show All Devices.
Erase the disk (not the volume) in Disk Utility.
Reinstall macOS.
Use Migration Assistant to recover all your data, apps and settings from Time Machine.

If you are not confident of doing this, take your Mac to a repair shop.
There are numerous examples on the web of people getting into this mess, and getting out of it!  For example: https://discussions.apple.com/thread/250731491