two hard drives in a Alienware m9700i/M9750 ?

if I put two 320GB hard drives in a Alienware m9700i/M9750(it has places for two hd) . will pc show one 640 GB hd or will it be two 320gb hd? if it will be one 640gb what will I need to do to make it work?
Answer #1
It will show as 2 drives unless you configure and use RAID. No need to do anything to make it work
Answer #2
Your PC will detect 2 separate hard drives..
Not possible for 2 HDs to show as one unless if you are using RAID..
Answer #3
Here are some tricks for you to choose from
http://lifehacker.com/5986883/how-to-combine-multiple-hard-drives-into-one-volume-for-cheap-high-capacity-storage
Answer #4
Those tricks are good when you want several drives to show up as one; but not so much when you want to have them show as separate ones – the default
Answer #5
Since you are installing 2 hard drive on your PC it’s going to recognize as 2 hard drive unless you do an raid.
As for the trick above… I don’t think it’s safe to do so.