They are on different storage pools. Each storage pool has its own counter.
Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
You have to attach it somewhere to see what is on it. Either the Hypervisor or the VM...
You can examine the structure of the disk from the hypervisor with : lsblk , fdisk , blkid
You can also use the same commands from within the VM...
I had a hard disk attached to a VM. I detached it. Now how to I reattach the unused disk to the VM?
SOLUTION:
Click on the Unused Disk, then click Edit (you won't be editing, but this is where we find the "Add" button).
Click the Add button:
Thank you. I was having problems with backups and discovered it. I'll get a good backup tonight and then attach it tomorrow and see if there is even any data on it. Thank you so much.
On one of my VM's I have "Unused Disk 0 Data:vm-101-disk-0"
Of course no one knows what this is. Is there a way to see if it has any data on it? I'm a bit apprehensive to just attach it.