Viverra Mauris

You are not understanding me. In order for it to address a 6tb drive, it MUST implement ALL 36 bits, or it will not be able to see the full drive. 6tb is not the largest number that needs 36bits. That is the 64tb value I quoted. Greater than that, it will require more active bits, which we do not KNOW are available. (We KNOW there are at least 36bits of active address, because the 6tb drive works.)