Most PCs and enclosures trap the heat inside the enclosure, then try to move that heat out with fans. With the open bay design of this enclosure, there is good passive airflow around the drive, particularly up and out of the bay – but it’s also easy to touch the drive, notice the temperature, and get worried about the heat generated.
Drives have a recommended temperature limit (check with the maker of your drive) which typically might be around 120 F/ 50 C, which is hot to the touch. So without measuring the temperature, it’s difficult to assume anything.
The docking station powers the drive normally - the docking station itself generates little heat. Because the bus is the main transfer bottleneck bottleneck, we recommend getting lower RPM or “eco” drives, which will also keep heat down so you can swap drives without worrying about temperature.
Hope this background helps to set expectations. If you have it, let us know the make/model of the drive and any temperatures you’ve seen. We’re marking this “not a problem” for now, but if you see temperatures which are beyond drive specs/expectations, we’d definitely jump on that and recommend next steps.
Again, hope that helps. Let us know if we can provide any other info!