Some of these ultra portable drives have concealed screws (as per your suggestion) under rubber feet. Some are snap closures - as is a lot of current electronic kit. The latter are a pain..., clearly designed both to discourage end-user access in event of problems (meaning one then has to return it the manufacturer for service etc.), and also cost cutting (no screws means fewer parts = cheaper to produce...!).
Many laptop manufacturers too have reduced the number of screws and rely more on snap closures to hold the case in place. And try getting an iPad or similar apart...
I would concur with your admonition not to take it apart - at least until one has explored all other options first.
message edited by trvlr