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#6 03-14-2010, 01:56 AM

here for future use guys

Officially, there are 1000 (10^3) megabytes (MB) in a gigabyte (GB). So 500MB would equal 0.5 GB.
(the (10^3) is saying 10 cubed, 10 with exponent of 3)

This definition is used in hard drives, portable memory drives (memory cards, USB drives), DVDs, Blu-ray disks, and most measures of performance. Some software (such as Mac OS X and the Linux kernel) uses this definition when displaying file and disk sizes.

Memory manufacturers use 1024 (210) megabytes per gigabyte, but this is more properly called a gigabinary byte (GiB), sometimes contracted to gibibyte.
Examples:

* 1,000 megabyte (MB) = 1 gigabyte (GB)
* 1,024 mebibyte (MiB) = 1 gibibyte (GiB)
* mega- = 1,000,000
* giga- = 1,000,000,000
* mebi- = 1,024 × 1,024 = 1,048,576
* gibi- = 1,024 × 1,024 × 1,024 = 1,073,741,824

Memory manufacturer definition

These are the definitions used by memory manufacturers and software like Microsoft Windows.

There are exactly 1024 megabytes (MB) in one gigabyte (GB)

MB stands for megabyte. Lowercase Mb has been used for both "megabyte" and "megabit". (Writing bytes as MB and bits as Mbit avoids any ambiguity.)

GB stands for gigabyte. Lowercase Gb has been used for both "gigabyte" and "gigabit".

1 megabyte = 8 megabits

1 megabyte = 1024 kilobytes

1 gigabyte = 1024 megabytes or 8192 megabits