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iOS
iOS, formerly known as iPhone OS, is the operating system for the iPhone, iPod touch and iPad. iOS has four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer. The OS takes less than half a gigabyte (GB) of the device's total memory storage, this means that users will not get their full storage space.
In iOS 4, it takes up ~1GB of space, probably due to the 2x graphics that have been added for the iPhone 4's Retina display.