iPhone OS is the operating system developed by Apple Inc for the iPhone and iPod touch.[1][2] It is derived from Mac OS X, and is based on the same Mach kernel and Darwin core as Mac OS X. iPhone OS has three abstraction layers: a Core Services layer, a Media layer, and a Cocoa Touch layer. The operating system takes less than half a gigabyte (GB) of the devices' total 4–32 GB storage.[3]
Many of the function of the iPhone and iPod touch are managed through iTunes version 7.3 or later, which runs on Mac OS X version 10.4.10 or later and on 32-bit versions of Windows XP or Vista.[4] The release of iTunes 7.6 expanded this support to include 64-bit versions of Vista.[5]
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