[quote name='makstaks']Will i lose backwards compatibility if i upgrade the HD in my 80gb?[/quote]
The HDD has nothing to do with the backwards compatibility. If you have a 60/20GB or a 80GB from the motorstorm or MGS4 bundle, you can upgrade the HDD however you want. The 40GB, core 80GB, and this new 160GB will only play PS1 games. It's the system itself, not the HDD space.