When you view the storage capacity of your ipod, iphone, ipad, or other electronic devices within its operating system, the capacity is reported using the the binary system (base 2) of measurement. in binary, 1 gb is calculated as 1,073,741,824 bytes.. So for ios 7.0.6, for the non-iphone 5s small form factor devices, you should get around 13.30-13.37 available memory if you're on a 16gb device. ios will round upwards for flexibility purposes, so 16-13.37 = 2.63, of which, you'd lose about 300-500 from storage conversion (kb to mb is 1024:1 rather than 1000:1).. If you want to know that how much memory is used by the system on the ipad then i suggest that you should run the system activity monitor app for the ipad. and you will see the active memory. free memory, wired memory, inactive memory, page ins, page outs and so many other memories currently occupied your ipad. so run this app and get the detailed answer for the memory usage on the ipad..
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