installation on 1 HD, 2 HD visible in "Disks", no "Disks available" for new pool

[rivfed]

Hello, I installed Truenas core ticking on both the check boxes of the two available disks (no instruction available).
When I wanted to add a pool there was no "Available Disks" to choose. In "Disks" both HD were labeled "boot-pool". So I said to myself I should have used only one disk for the intallation and I will re-install ticking only on the smaller drive. But nothing changed, both disks are visible with the label boot-pool and none is available for the new pool. Thank you
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[rivfed]

I booted with a linux usb key to delete metadata:
sudo dd if=0 of=/dev/sdb bs=1M count=100
Reinstalled
But nothing to do! "boot-pool" label is still there on both drives and no "Disks Available" :-(

 

[rivfed]

I booted again with the linux usb stick. Only sda was labeled "boot-pool" and I deleted the partion (although the problem should have been on the sdb). Re-installing truenas gave finally an available disk. In the fear I it was the broweser keeping the old data I used another. But also with the firs (chrome) it seems ok now