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Helpful answers
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Nov 13, 2015 10:17 AM in response to Daz Gby Phil0124,★HelpfulHow OS X and iOS report storage capacity - Apple Support
Understanding storage capacity in iPad, iPhone, iPod
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.
For example: The way decimal and binary numeral systems measure a GB is what causes a 32 GB storage device to appear as approximately 28 GB when detailed by its operating system, even though the storage device still has 32 billion bytes (not 28 billion bytes), as reported.
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Nov 13, 2015 10:18 AM in response to Daz Gby ShagCA,★HelpfulComputer manufacturer advertises in decimal. 128GB (decimal) in binary format is roughly about 119GB of usable storage space. iOS (operating systems) uses some (GB) amount of space.