That will work just fine. It's the same drive TiVo uses in 2TB TiVos. I'd skip any further testing, or time spent on the old drive, unless you just have nothing better to do, once you have the new one. USB 2.0 is excruciatingly slow. USB 3.0 is just as fast SATA-III (When it comes to the speeds platter drives can even realistically reach, even with the high-performance drives).