GE couldn't get away with calling its refrigerators "personal supermarkets" just as Honda could never refer to its minivans as "personal MTA buses." So how can storage vendors such as Iomega and Seagate call their network-attached hard drives "Personal Cloud" devices?
When it comes to Cloud storage and services, the hardware and software aren't the responsibility of the user. Somewhere a team of network engineers is burning the midnight oil to keep the server with your Dropbox account on it running, but as far as you know, it all just works. A hard drive that's plugged in to your router is not a Cloud unto itself; it's a connected storage device.