Do S-ATA HDD's work in S-ATA2 ports ?

[benktlottie]

Can I plug a normal S-ATA hard drive in a S-ATA2 port ? Will it work ?

I have a DFI expert coming, and I only have normal S-ATA hard drives...do I need to buy S-ATA 2 hard drives ?

 

[LewisStuart]

Excellent guide on this by smids here