More problem with hardisk

[Mrjack]

hello people. I installed freenas 9.1.1, I installed 2 from hardisk 250gb sata, but I have a problem with a third hard disk. the error is : UNABLE TO GPT FORMAT THE DISK "ADA2".
I read some posts in the forum but have not been able to solve, I think I understand that is the fault of the disk geometry, but I can not figure out how to solve.
I rely on you for help.
thank's

 

[dlavigne]

Have you tried clearing out the problematic disk using a third-party tool such as Parted Magic?