Thanks for the reply! If I connect both, will the slower UATA drag down the speed of the faster SATA?
Using the ATA strictly for storage shouldn't noticeably affect the speed. However, I would partition the 320 allocating about 30 to 35GB to the C drive for the OS/programs and the remainder for storage. This way when you have to reinstall the OS you don't have to worry about backing up data. The 80 would become a true back up drive. But again do not install the 80GB until Windows has been installed