So I have the replacement hard drive and I think I'm going to hold off installing it until Summer, because I'm concerned about losing cable for a few days in case I cannot get Comcast to re-pair the CableCARDs correctly over the telephone. I figure even with using TTG/TTCB, worst case would have us losing recordings just made (not enough time to TTG them [because they were "just" made]) as well recordings planned for the night I do the replacement and the night after that (and of course perhaps longer). What would mitigate this is if I can understand that if I have a problem with Comcast, I can just as readily reinstall the original primary drive and connect the eSATA drive, and be back to where I was before I did the replacement, i.e., with the CableCARDs paired properly. Is that a reasonable assumption? How much risk is there from swapping drives back and forth like that? My main inspiration for doing this replacement was lost recordings (the "partial" recording problem) allegedly due to the eSATA drive. However, since reseating the eSATA connection over the weekend, we haven't lost a recording yet. So I think dusting was the culprit in the problems we've had over the last month. As such, with the danger of losing recordings gone, the push to do the replacement is pretty small, now. Of course, if we lose another recording tonight, we'll be doing the replacement tomorrow.