The concept is sound: a portable hard drive that creates its own Wi-Fi hotspot to stream media to portable devices like iPads and iPhones (amongst many others). But this system comes with many first-generation drawbacks.
The Satellite looks exactly as you expect it to; a glossy black box with the footprint of a passport but thicker. Seagate's design is sharp and simple, with a nice silver-coloured trim and a minimum of ports, buttons and LED lights. On the base of the Satellite is a single proprietary USB port for data transfers with a PC (or Mac) and charging the hard drive to its five-hour playback capacity.
It's lightweight too, at only 260 grams, so there's no issue with chucking the GoFlex Satellite in a bag and lugging it around with your laptop or tablet.
Wi-Fi is central to the user experience of the GoFlex Satellite, and it's this feature that sets the drive apart from most of its competitors. Inside the case, alongside the 500GB hard drive, is a Wi-Fi radio compatible with the 802.11b/g/n protocols. When you turn the Satellite on, the Wi-Fi chip switches on, too, creating a personal hotspot dedicated to the hard drive. You then connect to the drive the way you would to any Wi-Fi network from whichever device you are using.
Once connected you can access any media stored on the drive and stream it to your tablet, phone or computer. If you are using iOS or Android there are dedicated apps to download through the respective App Stores and Markets, and if you are using anything else you simply launch the web browser on the device to see the Seagate media menu. These apps and web-based user interfaces are colourful and well designed with clear option titles and a finger-friendly layout. The Satellite supports WPA security, and while this is a lightweight security profile, it should be sufficient to protect a device that you can neither write to or from.
The major downside to this set-up is that the software only supports data transfers in one direction; you can stream media from the Satellite, but you can't push data to it over Wi-Fi. In fact, you can't permanently transfer data from the hard drive to a connected PC, etc, only temporarily transfer data during a media stream. This is a big chink in the Satellite's armour, which massively restricts the use cases for this drive down to just "sitting on [insert mode of transport] and listening to/watching media". When you are paying a huge premium for the Wi-Fi component in this drive, we'd expect it to be more versatile.