According to this prefix standard, 1 mebibyte (1 MiB = 220 B = 1,048,576 B) and 1 megabyte (1MB =106 B = 1,000,000 B) are not equal. Because these prefixes are not in widespread use (and they might never be), M in most cases can indicate both decimal millions of bytes and binary megabytes. Similarly, G is often used to refer to decimal billions of bytes and binary gigabytes. In general, memory values are expressed by using the binary values, although disk capacities can go either way. This often leads to confusion in reporting disk capacities because many manufacturers tend to use whichever value makes their products look better.