Good to know for future reference. I noticed they are mixing it up using both Seagate and WD. Is it limited to one or the other? I like to be sure I provide facts, and not just what is reported by others, and appreciate that you didn't flog me for not knowing they have started using them. Really, I do. When the TiVo HD originally came out they used SATA1, then went to SATA2 (I bought two of the first batch made and two of the last ever made). The Premieres came with SATA2 from the start, and I can attest that the TiVo HD & Premiere both emulate IDE ATA133, regardless of the drive (if you know when to watch the logs, and where to look, it is logged what modes the TiVo sets, as well as the block sizes). As for the Roamio, I have it from a reliable source, that it appears TiVo still hasn't found it necessary to change this, but nothing concrete on if they've moved beyond IDE ATA133 emulation, as the mode the TiVo sets. I'm not in-the-know enough to know how hard, or easy, it would be for them to change it. I figure if it's hard, and they don't need to, they won't do it. I'd love to hear from somebody who can shed any light on this (if TiVo has changed the mode/emulation). I'm pretty sure it's purely a matter of what they can get (due to availability/supply/pre-allocation) and at what price, at the time. I used to work for a system builder, so I know how the game works, with drives that are in high demand (even if all that demand is one giant company). I wouldn't be surprised if they install SATA2 drives in on Tuesdays, and SATA3 on Wednesdays, etc. Anyway, the takeaway from all this, that matters, is that nobody should expect any performance gain, in a Roamio, by using SATA3, nor should they expect any loss of performance by using SATA2. No worries about using either.