To the OP, while I agree with what
LethalWolfe said I can give some real world feed back about that drive. I have used mine which has the 7200rpm drive in it for recording live video streaming events, doing editing of those events and then off loading that footage to another work station over the course of two (2) years and it has been fine.
The load which I had, might not be as heavy as your's but it is as follows:
Record a weekend event seminar, hours of recording were 14+ hrs. at 1.5-2 hr. intervals and if a Friday night was included that would add 3 hrs. broken in half of course.
After each day we would go through and edit where needed, add titles, dates and so on then off load each night to another drive. This would add time for editing as well on that drive.
I used FW800 because they didn't invest in an Esata card but no big deal, to me any way. I would say over the course of the two (2) years the drive had logged around 500+ hrs. of streaming alone, then add in the edit times and it is still running fine.
I made sure that if a small clip fan could be used it was or one of those laptop fan trays to place the hard drive on to add a cooling method but to be honest, most of the time except at night, it had only the case to keep it cool.
Again like Lethal said, it will run warm to your definition of hot. The one I used would get hot per se but still holdable so the heat sink did it's job. I think for a small little unit those are built like tanks and the only thing better in a small form factor if cost is no concern would be an SSD unit using TB or the Esata/FW800.
I know one IT guy mentioned bringing a small piece of marble (think like the flooring stuff) the size of the drive to place under to help draw the excess heat away from the drive. He said every little bit could help, not sure if this does but he uses a small piece when he does the events
If you don't mind a slightly bigger case, I have the OWC mini Al case for an extra drive and I think that does a better job of cooling the small drive as I use one for personal travel. Keep that in mind as a backup to the G-Drive if need be