Do hard drives really have open cases now?

I'm shopping for new hard drives and all the stores (Amazon, Overstock, Newegg, etc.) now show product pictures like this:

I can find no information in the product descriptions or in Google searches stating that this is just another marketing gimmick and that the drives really are enclosed.
Here's an example hard drive page on Amazon.

The replacement drives are to go into an external array (Drobo) that blows unfiltered air over its drives. Last I heard, even the tiniest bit of dust can trash drive components, but maybe technology has changed on me again?

• Is dust no longer a concern for 2 and 3 TB drives?


• Are these units really covered? I don't want to spend a few hundred bucks to order them before knowing.


• If they really are covered, what reason would a marketing team have to only show pictures of the guts?


• If they are not covered, how do I buy one that is?

Answer

Comparing the TigerDirect page for a Seagate ST2000DM001 to the Amazon page for the ST2000DM001, we see that the TigerDirect page includes a few more pictures for that exact model number.
One of the pictures shows the drive with the case on.

This suggests that the other 3 stores you checked just decided, for whatever reason, not to show the product as shipped. This would be a marketing decision. The drives either still come enclosed or the Seagate ST2000DM001 is different from different stores -- which doesn't seem likely.