Passive Cooling and I've never been a fan (pun intended). The interior of the case is probably aluminum to draw heat from the drive. But, again, I don't trust passive cooling.

Excellent design as far as looks go.

I own three external drive cases: A Bytecc with a fan, another something brand that is all aluminum but no fan, and a 2.5 inch drive case for laptop drives with no fan. Guess which one I keep running. I use the other two for backups and such where the drive will not be running for long.

Just my thoughts.