Yes I seen your post #1007, however you also made no mention in that post about the heat sink issue not working with any drive that is thicker than the 320gb stock drive. So, I left the heat sink off, but I also left the back of the top cover on the 7400 open a bit at the rear of the unit.
Seeing as how the Seagate ST1500LM003 1.5tb drive when used in their very small and rather tightly sealed FreeAgent GoFlex enclosure, has no heat sinking at all on the drive, and also no provisions for any air flow at all to the drive either. I'm not real concerned about the drive getting too hot, as for the 7400 and any issues from extra heat from the larger drive, I guess time will tell and we will soon see were that ends up.
I bought the 7400 from Walmart, so I have 90 days to put the stock hard drive back in it and return it if decides to fry itself from the hard drive swap. As far as the using external eSATA connection, I had no reason to try that as I wanted a larger drive internally.