If you're going to go SATA with a JMicron or Marvell chipset based adapater, might as well spend a few extra bucks and get a 1TB instead of a 500. The problem is the models I could name might not be the same as when I got mine, despite the model number being the same. For instance, somebody around here said that the WD10EADS is now an AF drive, but it didn't use to be. I'm successfully using a Samsung HD103SJ in a 240, but it was one they made before Seagate bought them out, so I can't offer any guarantees about the current product being sold under that name. I'm using WD1001FALS drives in a couple of S2 DTs, but I got them at a good price Black Friday of 2010--they're Caviar Blacks, which is kind of overkill and I've got extra fans in the DTs because those drives run kind of toasty. I'd avoid any drive rated for 6Gb/s 3Gb/s is plenty enough for a TiVo, in fact the original 1.5Gb/s is fast enough. A Caviar Blue won't work in an S1 for some reason, but I ran one (PATA model) in my first S2 DT for a while, and someone reported success with the 1TB SATA model, but that was a couple of model changes ago. You need to find someone with new old stock or a lightly used used drive, I fear.