Sata 2 with Sata 1?

[M!!cook]

Hello all!
i have 4 150gig raptors and 2 500gig sata 1 drives, crazy as it may sound, i need more space! (Mainly downloads, lots of movie work and the good old 1gig images)
I am unsure if sata 2 will work with the rest of my drives?
I have a DFI Expert.
I sata 2 backwards compatible?

 

[M!!cook]

so in theroy, i buy some sata 2's, i will recive them as sata 1's?