I am impressed at how temperature, in steady normal operation, keeps decreasing.
30 C and 32 C degrees respectively.
I'll add this piece of info: the Seagate, being on top, should in fact be a bit warmer as it takes heat coming fromt he WD HDD below it (hot air will move up, naturally) So, the Seagate does not see that much hotter than the WD after all, it would appear.

Mark, indeed, this is possibly the best case I had for a home server. The top half is cooled really, really well, so, MoBo CPU, Video card are all at ideal temperature. The bottom half only has room for 2 80cm fans in the back left side of it. But, hot-swap HDD location, front right, right in front of the PSU, is completely lacking any ventilation. Which is quite silly as
1. there is plenty of room for a side fan
2. even just ventilation holes at the bottom of the side panel would heve helped. Such hole wuld have been right where the HDD are.