the upper drive cage can only support 2 hard drives. move the raptors here. leave the 500gb seagate in the lower chamber and screw cooling it. its a 500gb drive, screaming performance and heat generation arent exactly qualities that it boasts.
in fact, even if it did put off a very high volume of heat, passively cooling it should be enough anyway. the fan in the PS in the lower chamber would be moving air around a bit... but who cares? if you've read google's recently delivered white paper on enterprise-storage, you would have seen that years of real-world data and analysis on temperatures and drive failure don't exactly go hand in hand. patterned drive failure is more likely due to the drive's media defects or electrical problems. heat = drive failure is a huge joke.
as a general reminder, not ever piece of hardware ever made needs a fan to cool it. don't waste your money.