wipe disk "operation not permitted"

Hi
I am new to FreeNAS.
I have set up an old HP ML110G5 server with 3 disks
ada0 120G SSD SATA
ada1 1000G SATA
ada2 1000G SATA

FreeNAS 11.2-U2.1 installed fine on ada0
I get error when trying to add pool on ada1 and ada2

Command '('gpart', 'create', '-s', 'gpt', '/dev/ada1')' returned non-zero exit status 1.

I have tried dd and gmirror destroy commands but I get an error all the time



The two 1TB disk came from an Openmediavault nas installation and before...

wipe disk "operation not permitted"