Load up this 500GB Satellite Wireless Mobile Storage disk from Seagate with your media library from either a Mac or Windows computer and it can serve data to up to three iPads at once using the free app optimized for iPad. It works with other tablets and smartphones, too – most mobile devices with Wi-Fi connectivity and a web browser. The Satellite has a rechargeable battery that provides up to 5 hours of playback time or 25 hours of standby time. The Satellite uses USB 3.0 for fast transfers from your computer, but it’s part of the GoFlex line, which means you can purchase a Firewire 800 or powered eSATA connector if your computer doesn’t have USB 3.0. It comes with a wall charger and a car charger. It’s available for pre-order at Seagate for $199.99.