Yottabyte
From Biocrawler, the free encyclopedia.
| Multiples of bytes | ||||||
|---|---|---|---|---|---|---|
| Decimal prefixes | Binary prefixes | |||||
| Name | Symbol | Multiple | Name | Symbol | Multiple | |
| kilobyte | kB | 103 | kibibyte | KiB | 210 | |
| megabyte | MB | 106 | mebibyte | MiB | 220 | |
| gigabyte | GB | 109 | gibibyte | GiB | 230 | |
| terabyte | TB | 1012 | tebibyte | TiB | 240 | |
| petabyte | PB | 1015 | pebibyte | PiB | 250 | |
| exabyte | EB | 1018 | exbibyte | EiB | 260 | |
| zettabyte | ZB | 1021 | ||||
| yottabyte | YB | 1024 | ||||
A yottabyte (derived from the SI prefix yotta-) is a unit of information or computer storage equal to one septillion (one long scale quadrillion) bytes. It is commonly abbreviated YB.
1 yottabyte = 1024 bytes = 1 000 000 000 000 000 000 000 000 bytes
It is a pleasant coincidence that Avogadro's number, 6.0221415×1023 is approximately equal to 279. That is, Avogadro's number is almost a "round number" in binary, and a (binary) yottabyte is approximately 2.01 × Avogadro's number of bytes. Humorously, it can be said that a (binary) yottabyte is about 2 moles of bytes.
How many yottabytes would it take to describe a single human being? Assuming the average adult human is 74.8 kg (165 pounds), we can determine a rough estimate of how many moles of atoms are in the human body. Since the body is made up of 65% oxygen, 18% carbon, 10% hydrogen, 3% nitrogen, 1.5% calcium, and other elements, one could use a periodic table to show that the average human body contains about 11 800 moles of atoms. If one would commit a single byte of information to store the location of every atom contained in the body of a human, it would require about 5 900 yottabytes! (One byte per atom would not actually be sufficient, however.)
