The product has an intermittent issue (that I believe is related to the Drive Sleep function) which causes it to freeze, disappear on the network and become unresponsive to a long-press Shutdown. The only way to recover is to unplug the power cord and plug it back up. This obviously makes the unit unsuitable for its purpose. Presently I use the unit as a powered down file backup instead of a NAS. I've participated on the manufacturer forums with a dozen other people who are experiencing the SAME problem, trying to debug the issue on our own, but there no official response from Western Digital except they 1) claim they cannot reproduce the issue, and 2) provide "helpful" links that do not describe the actual problem. They need the engineer that designed the unit to investigate the problem and provide a firmware upgrade. I will revise my review if the problem is resolved but at this time I cannot recommend this product.