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If the hdd is already unlocked then it cannt unlock it again so from the logic of retail BIOS it assumes there is something wrong and it gives you "error 6" or "error 7".
wrong. if they tried to unlock it again, nothing would happen. the hdd would still be unlocked, however...
there are two different "unlocked" states
fully unlocked - like if you used hdlock to unlock your drive
temporarily unlocked - like when the xbox is on, the hdd is temporarily unlocked - when power is taken away the hdd will relock again
the xbox knows the difference - if it's the first one - no go.
it probably checks to see if the hdd is unlocked before unlocking anyway.