A megabyte is a unit of information or computer storage equal to approximately one million bytes. Megabyte is commonly abbreviated as MB (not to be confused with Mb, which is used for megabits), and sometimes as meg.
As of 2005, the storage capacities of hardware devices such as Hard drives are given as 1 megabyte = 1,000,000 bytes (especially for items made in Japan, as Japan has standardized on the metric definition). Other capacities, such as for the RAM capacity of most personal computers, are given as 1 megabyte = 1,048,576 bytes (also known as a "mebibyte").
Depending on compression methods and file format, a megabyte of data can hold:
a hundred small images, or
roughly a minute of compressed music.
A digital photograph produced by a typical digital camera in 2005 might be between 1–4 MB depending on the camera's image resolution and level of compression used.
Until the introduction of hard drives with a capacity of one gigabyte or more, the capacity of hard drives was measured in megabytes.
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