Megabyte

v t e Multiple-byte units
Decimal Value Metric 1000 kB kilobyte 10002 MB megabyte 10003 GB gigabyte 10004 TB terabyte 10005 PB petabyte 10006 EB exabyte 10007 ZB zettabyte 10008 YB yottabyte 10009 RB ronnabyte 100010 QB quettabyte	Binary Value IEC Memory 1024 KiB kibibyte KB kilobyte 10242 MiB mebibyte MB megabyte 10243 GiB gibibyte GB gigabyte 10244 TiB tebibyte TB terabyte 10245 PiB pebibyte – 10246 EiB exbibyte – 10247 ZiB zebibyte – 10248 YiB yobibyte – 10249 – – 102410 – –
Orders of magnitude of data

The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB. The unit prefix mega is a multiplier of 1000000 (10⁶) in the International System of Units (SI).^[1] Therefore, one megabyte is one million bytes of information. This definition has been incorporated into the International System of Quantities.

In the computer and information technology fields, other definitions have been used that arose for historical reasons of convenience. A common usage has been to designate one megabyte as 1048576bytes (2²⁰ B), a quantity that conveniently expresses the binary architecture of digital computer memory. Standards bodies have deprecated this binary usage of the mega- prefix in favor of a new set of

(symbol MiB).

The unit megabyte is commonly used for 1000² (one million) bytes or 1024² bytes. The interpretation of using base 1024 originated as technical jargon for the byte

. Nevertheless, the term megabyte continues to be widely used with different meanings.

Base 10

1 MB = 1000000 bytes (= 1000² B = 10⁶ B) is the definition following the rules of the

Mac OS X 10.6 file manager is a notable example of this usage in software. Since Snow Leopard, file sizes are reported in decimal units.^[4]

In this convention, one thousand megabytes (1000 MB) is equal to one gigabyte (1 GB), where 1 GB is one billion bytes.

Base 2

Main article:

Mebibyte

1 MB = 1048576 bytes (= 1024² B = 2²⁰ B) is the definition used by

GiB

).

Mixed

1 MB = 1024000 bytes (= 1000×1024 B) is the definition used to describe the formatted capacity of the 1.44 MB 3.5-inch HD floppy disk, which actually has a capacity of 1474560bytes.^[5]

Randomly addressable semiconductor memory doubles in size for each address lane added to an integrated circuit package, which favors counts that are powers of two. The capacity of a disk drive is the product of the sector size, number of sectors per track, number of tracks per side, and the number of disk platters in the drive. Changes in any of these factors would not usually double the size.

Depending on compression methods and file format, a megabyte of data can roughly be:

• a 1 
  1152 × 864) with 256 colors (8 bits/pixel color depth
  ) stored without any compression.
• 6 seconds of 44.1 kHz/16 bit uncompressed CD audio.
• 1 minute of 128 
  kbit/s MP3 lossy compressed
  audio.
• a typical English book volume in plain text format (500 pages × 2000 characters per page).

The novel

The human genome consists of DNA representing 800 MB of data. The parts that differentiate one person from another can be compressed to 4 MB.^[8]

• Timeline of binary prefixes
• Gigabyte § Consumer confusion

External links

• Historical Notes About The Cost Of Hard Drive Storage Space
• the megabyte (established definition in Networking and Storage industries; from whatis.com)
• International Electrotechnical Commission definitions
• IEC prefixes and symbols for binary multiples Archived 2004-06-15 at the Wayback Machine