Seagate has introduced the GoFlex Satellite portable hard drive for use with iOS devices such as the iPad and iPhone. The external hard drive includes a Wi-Fi interface as well as the ability to stream photos and movies to your iOS device.
Rather than rely on a buffered stream from a distant provider, GoFlex Satellite mobile storage wirelessly serves up media content as a local attached storage for up to three devices at the same time. With a stand-by battery life of up to 25 hours, the powerful lithium polymer battery delivers up to 5 hours of continuously streaming video.The expected use case is for you to fill up your drive with movies and media prior to travel and to use the device as a local wireless server. Movies can be streamed over any browser, but there is also an iOS-specific app that lets you interface the media. It supports streaming to up to 3 devices at once.
It comes with 500GB of storage, offers USB connectivity to your Mac, and 25 hours of standby and 5 hours of battery life. It's presently available from Amazon and BestBuy.com for $199.