I just upgraded my Premiere XL with a Samsung EcoGreen F4 HD204UI 2TB. I chose the Samsung because it has more favorable reviews on Newegg than the WD drives, and the power usage is even lower than WD drives. Copying took just under seven hours hooked to the motherboard of my ancient Dell (I think it has SATA I). While copying, I had the drive vertical, and it was silent. Installed in my Tivo it is horizontal, of course, and now, really loud! I pulled it to reset AAM, which is set to "disabled" as delivered. When set to "quiet" by Samsung's ES Tools, it is very close to the WD drives I have. One thing is a little odd: my Tivo shows 301 hours of hd capacity. I don't know how I managed that(I think most people are getting about 317 with 2 Tb). Just a note: although Samsung doesn't make a big deal of it, the reviews I read say this is "advanced format" like the new WD drives. P.S.: Many thanks to Comer.