Hard disk drive producer indicate disk capacity by means of the SI prefixes mega-, giga- and tera-, and their short forms M, G and T. Byte is characteristically abbreviated B. For example, the prefix mega-, which on the whole means 106 (1,000,000), in the milieu of data storage can mean 220 (1,048,576), which is almost 5% more. Alike usage has been pertaining to prefixes of superior scale. This results in a inconsistency among the disk manufacturer’s affirmed capacity and the obvious capacity of the drive when looked at because of most operating-system tools. The dissimilarity happens to be all the more obvious (7%) for a gigabyte.