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Calculate number of bits saved

File size is a measure of how much data a computer file contains or, alternately, how much storage it consumes. Typically, file size is expressed in units of measurement based on the byte. 

By convention, file size units use either a metric prefix (as in megabyte and gigabyte) or a binary prefix (as in mebibyte and gibibyte).

When a file is written to a file system, which is the case in most modern devices, 
it may consume slightly more disk space than the file requires.