Tech companies exaggerate and outright lie to get you to buy their products. Don't believe the hype.
When you get a new smartphone or computer, there's a certain amount of the storage space that you can't access that is reserved for the operating system, drivers and whatnot. A 16 gigabyte iPhone 5, for instance, actually has 13.8 GB of available storage.
But when Microsoft (MSFT) started putting Windows 8 on tablets last year, and the 64 GB Surface Pro only had 23 GB of usable space, Microsoft's storage space specifications became downright comedic.