Units

Summary

New Spec
Name	Symbol	Power	Size in bytes
Byte	B	10⁰	1
Kilo Byte	KB	10³	1,000
Mega Byte	MB	10⁶	1,000,000
Giga Byte	GB	10⁹	1,000,000,000
Tera Byte	TB	10¹²	1,000,000,000,000
Peta Byte	PB	10¹⁵	1,000,000,000,000,000
Exa Byte	EB	10¹⁸	1,000,000,000,000,000,000
Zatta Byte	ZB	10²¹	1,000,000,000,000,000,000,000
Yotta Byte	YB	10²⁴	1,000,000,000,000,000,000,000,000

Old Spec
Name	Symbol	Power	Size in bytes
Byte	B	2⁰	1
Kibi Byte	KiB	2¹⁰	1,024
Mebi Byte	MiB	2²⁰	1,048,576
Gibi Byte	GiB	2³⁰	1,073,741,824
Tebi Byte	TiB	2⁴⁰	1,099,511,627,776
Pebi Byte	PiB	2⁵⁰	1,125,899,906,842,624
Exbi Byte	EiB	2⁶⁰	1,152,921,504,606,846,976
Zebi Byte	ZiB	2⁷⁰	1,180,591,620,717,411,303,424
Yobi Byte	YiB	2⁸⁰	1,208,925,819,614,629,174,706,176

CraigNDave

https://www.youtube.com/watch?v=9kzCoDFrMGE&list=PLCiOXwirraUCa2MYf_oSM94uvwIGPMZ1q

Computer Science Tutor

https://www.youtube.com/watch?v=Ol3PxSpEeT4&list=PL04uZ7242_M6O_6ITD6ncf7EonVHyBeCm

New Units

Computer Science units are now based around the powers of 10

Powers of 10

For each unit add 3 to the power to go up in powers of 10 for each unit of data for example : 1GB = 10^9 with the power of 10 being 1,000,000,000 bytes However if you subtract three powers from 10^9 then 10^6 = 1,000,000 bytes

The Bit

The Bit is a single binary digit used in computing and is represented using either a 1 or 0. The two values of a single digit act as an On or Off function or True/False and putting them together can result in unique functions as 1 digit can control one variable and another digit can control an entirely different variable. By putting multiple bits together functions become more complex and have more outcomes as if you set one value to true it can lead to another set of values different to what you would get if it was set to false. Putting 8 of theses bits together is called a byte

The Byte

A byte is made up of 8 bits, and larger amounts of data are based around the value of a byte (e.g Gigabyte being 1,000,000,000 bytes). A single byte represents one binary number, as it is made up of a total of 8 1's and 0's. A single byte can also represent a single character, such as the letter B.

Kilo Byte

A Kilo Byte is 1000 bytes. It is also a multiple of the byte unit with the prefix (kB).

Mega Byte

A Mega Byte is 1000 Kilo Bytes, thus is 1000000 Bytes. In Base 10 the prefix Mega is 10^6.

Giga Byte

1 giga byte (1Gb) is 1000 megabytes and also 1 Gigabyte (G / GB) = 10^9 bytes = 1,000,000,000 bytes

Tera Byte

1 TeraByte = 1,000 GigaByte, 10^12 bytes

Peta Byte

Symbol PB Power 10^15

Exa Byte

Symbol: EB Power: 10^18 Bytes: 1,000,000,000,000,000,000

Zetta Byte

Symbol: ZB Power: 10^21 Bytes: 1,000,000,000,000,000,000,000

Yotta Byte

Yottabyte (YB) is a unit of digital information that equals to one septillion (10^24).

Old Units

Units based around powers of 2, according to the spec you don't need to know these.

Powers of 2

A power of two is a number of the form 2ⁿ where n is an integer. (e.g. 7).

Power of 2	Equivalent
2⁰ = 1	(Anything to the power of itself is always 1)
2¹ = 2	2x1 = 2
2³ = 4	2x2 = 4
2⁴ = 8	2x2x2 = 8
2⁵ = 16	2x2x2x2 = 16

Etc.

Kibi Byte

A kibibyte is a multiple of the unit byte, with the binary prefix 'kibi' meaning 2 to the power of 10 or 1024 bytes. Therefore meaning 1 kibibyte is 1024 bytes.
The unit symbol for a kibibyte is KiB.

Mebi Byte

The binary prefix mebi means 2^20; therefore one mebibyte is equal to 1048576bytes = 1024 kibibytes.

The unit symbol for the mebibyte is MiB.

1 MiB = 2^20 bytes = 1024 kibibytes = 1048576bytes

Gibi Byte

1 GiB is equal to 2^30. (Two to the power of thirty)

1 GB = 0.931323 GiB

Tebi Byte

A tebibyte is a unit of data storage that equals 2 to the 40th power, or 1,099,511,627,776 bytes. While a terabyte can be estimated as 10^12 or 1,000,000,000,000 bytes, a tebibyte is exactly 1,099,511,627,776 bytes.

Pebi Byte

A Pebi Byte is a multiple of the unit byte, used for digital information.

The prefix for pebi is Pi and the prefix for pebibyte is PiB 1,125,899,906,842,624 bytes and is equivalent to 1024 tebibytes or 1 pebibyte.

to get from pebibytes to bits, you can do: pebibytes times 2 to the power of 50 (PiB x 2^50) or pebibytes times 1024 to the power of 5 (PiB x 1024^5) and to get from bits to pebibytes, you can do: bits divided by 2 to the power of 50 (bits / 2^50) or bits times 1024 to the power of 5 (bits / 1024^5)

Exbi Byte

2^60

Zebi Byte

2^70

Yobi Byte

2^80

Bits Bytes etc

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