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From Ian Craig:
ByteMath is a free utility to take away the mystery and confusion that often plagues consumers shopping for computers and similar electronics. What are TBs? How do they compare to GBs? Use this handy calculator to know exactly what you're getting, in terms of data storage.ByteMath will convert megabyte, gigabyte, and terabyte values to each other in any order. These are three of the most common units of digital storage. ByteMath accepts whole numbers as well as decimal values for input.PLEASE NOTE: for accuracy, these calculations are made by multiplying or dividing values by numbers like 1024 (2 to the 10th power) instead of numbers like 1000. Manufacturers may approximate or round advertised data storage quantities and thus, results may seem to differ slightly from product labels.Additionally, results are limited to three decimal places. Therefore, a number in the thousandths place of a result may be rounded.This app is supported by iAd.