Hi Yves,
Yes, the unit does not have a smart fan. It was initially designed to fit into enterprise environment, hence the build quality and adjustable fan speed feature. However, as we see the demand for 15mm 4TB increases, we may consider to develop a cage that will case them. We may also add the smart fan feature into consideration! In the meantime, please subscribe to our newsletter for update on upcoming product:http://www.icydock.com/epaper.php