As for the safe, it's rated to keep the internal temp below a max 177 degrees celsius for 2 hours.
I'm guessing that is under conditions of a "typical" house fire. What if the fire burns longer than two hours?
In any case, I doubt that a hard drive would survive for any length of time at 177 degrees C (350 degrees F). All the plastic bits would melt, possibly the case would warp, and you are actually perilously close to the melting point of many common solder alloys.
I think the best you could hope for would be that the platters themselves might be undamaged enough that a recovery $peciali$t
might be able to save some of the data.
tanstaafl.