In his second session, Mr. Anurag Sharma explained the four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer. He discussed the current version of the operating system (iOS 8.0) which dedicates 1.3 - 1.5GB of the device's flash memory for the system partition, using roughly 800 MB of that partition (varying by model) for iOS itself. It runs on the iPhone 4S and later, iPad 2 and later, all models of the iPad Mini, and the 5th-generation iPod Touch.
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