List of all file sizes (Bytes, KB, MB, GB, TB)
A byte is a sequence of 8 bits (enough to represent one alphanumeric character) processed as a single unit of information. A single letter or character would use one byte of memory (8 bits), two characters would use two bytes (16 bits).
Put another way, a bit is either an 'on' or an 'off' which is processed by a computer processor, we represent 'on' as '1' and 'off' as '0'. 8 bits are known as a byte, and it is bytes which are used to pass our information in it's basic form - characters.
An alphanumeric character (e.g. a letter or number such as 'A', 'B' or '7') is stored as 1 byte. For example, to store the letter 'R' uses 1 byte, which is stored by the computer as 8 bits, '01010010'.
A document containing 100 characters would use 100 bytes (800 bits) - assuming the file didn't have any overhead (additional data about the file which forms part of the file). Note, many non-alphanumeric characters such as symbols and foreign language characters use multiple bytes.
Table of all file sizes
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Traditional units
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Name
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Symbol
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Binary
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Number of bytes
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Equal to
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Kilobyte
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KB
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210
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1,024
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1024 B
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Megabyte
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MB
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220
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1,048,576
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1024 KB
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Gigabyte
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GB
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230
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1,073,741,824
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1024 MB
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Terabyte
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TB
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240
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1,099,511,627,776
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1024 GB
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Petabyte
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PB
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250
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1,125,899,906,842,624
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1024 TB
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Exabyte
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EB
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260
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1,152,921,504,606,846,976
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1024 PB
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Zettabyte
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ZB
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270
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1,180,591,620,717,411,303,424
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1024 EB
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Yottabyte
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YB
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280
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1,208,925,819,614,629,174,706,176
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1024 ZB
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