Well, maybe I'm a glutton for punishment, but I'm gonna go for the Seagate 7200.11 ST31500341AS 1.5TB drive. Yeah, there have been firmware issues, I'll make sure it's updated. The drive will almost certainly be overkill for a TIVO HD. That said, I ordered it from NewEgg during their 15% off PayPal promotion for $129 shipped, so it netted out to just over $110. Bad news: First shipment didn't reach me. Good news: They're sending out a replacement, so once I get it I'll try the upgrade. Amarand & I have something in common - about four or five original TIVO drives packed away. If any of mine died tomorrow, hopefully I'd have a simple drive swap to get them up & running again. For me, it's simply not worth reformatting a 40 or 80 GB drive for use elsewhere. So, I've got a bunch in a box, waiting for a rainy day. I've used MFSTools, then MFSLive for my previous upgrades. For the TIVO HD, I'll use WinMFS. I think I've got a pretty good handle on it; for those who have done things both ways, any suggestions on how to prepare? It seems like it outta be pretty straightforward. As far as the Seagate 1.5TB, after I've had the TIVO HD running a few days I'll back up the original drive then try the upgrade. First, I'll go for the full 1.5TB, but I understand it's likely not to work due to partition-sizing issues. Will report here. If that doesn't work, then I'll try a slightly smaller partition - I seem to remember finding a number somewhere between 1.2 & 1.3 TB as the max usable size, but can't locate it now. Assuming I'm willing to 'throw away' some space on the drive, can I attempt something like this? Either that, or has anyone tried creating two partitions on a drive like this to see if Tivo will address it like it has with two separate drives in the past? (i.e. 'Marry' them together as one volume.) Regardless what happens, worst-case scenario I'll use the Seagate in a desktop computer ... but I'd rather have it in the TIVO for a little extra storage over a 1 TB drive. I want to do the upgrade one time & leave it be for the life of the unit. The noise doesn't matter to me, as this will be in a large room with a DLP TV. If the Seagate doesn't work, I guess my plan 'B' will be a Hitachi - although several here have had good luck with Western Digital, my history with them precludes me going with that option.