Download the h/w specs for your hard disk from the seagate site and check if the disk temp temp reported (/usr/ports/*/smartmontools) are within reasonable limits.
i wouldn't fret too much about this unless you are talking about performance drives like the raptor (10k rpm), those might require more attention with regards to cooling, cabinet air flow etc.
In general, there isn't much difference in quality b/w the different drives.
Opt for drives that have 3/5 yrs warranty.
just for info, all my disks are seagate.
Hard disks may come cheap these days but keep in mind they are very advanced, high precision devices.
> Also, I have heard that Seagate hard drives run hot -- any knowledge of that?
Generalizations like that are obviously BS.