Last week, we reviewed Seagate's FreeAgent Go portable hard drive, and came away impressed with the unit. Today, we have the company's FreeAgent Pro in our lab, and it, too, appears to be another successful product in Seagate's product line. Unlike the FreeAgent Go, the Pro offers a standalone, NAS alternative to more complicated units. And while the company promises 24/7 connectivity, it's a bit complicated, and technically not the case. Allow us to explain.