Bit
- A "bit" is atomic: the smallest unit of storage
- A bit stores just a 0 or 1
- "in the computer it's all 0's and 1's bits
- Anything with two separate states can store 1 bit
- In a chip: electric charge = 0/1
- In a hard drive: spots of North/South magnestism = 0/1
- A bit is too small to be much use
- Greoup 8 bits together to make 1 byte
NOTE
:- Everything in a computer is 0's and 1's. The bit stores just a 0 or 1: It's
the smallest building block of storage.
Byte
- One byte = collection of 8 bits
- eg. 0 1 0 1 0 1 0
- One byte can store one character , eg. 'A' or 'x' or '$'
How do you calculate bytes?
The calculations is based on:
In the cases when used to describe data storage bits/bytes are calculated
as follows:
1 byte = 8 bits
1 kilobyte (K / Kb) = 2^10 bytes = 1,024 bytes
1
megabyte (M / MB) = 2^20 bytes = 1,048,576 bytes
1
gigabyte (G / GB) = 2^30 bytes = 1,073,741,824 bytes
1
terabyte (T / TB) = 2^40 bytes = 1,099,511,627,776 bytes
1 petabyte (P / PB) = 2^50 bytes = 1,125,899,906,842,624 bytes
1 exabyte (E / EB) = 2^60 bytes = 1,152,921,504,606,846,976 bytes
The period (.) is used as decimal separator.
How many digits are in 8 bytes?
Eight bytes contain 64 bits of information, so you can store 2^64 ~
10^20 unique items using those bits. Those items can easily be interpreted as
the integers from 0 to 2^64 - 1 . So you cannot store 302 decimal digits in 8
bytes; most numbers between 0 and 10^303 - 1 cannot be so represented. How do you calculate bytes?
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