Bits, Bytes, Gigabytes.

A stupid reminder to myself so I don’t mess up system design interviews in the future.

• bit - 1 bit = 1 binary digit, either 1 or zero.
• byte 1 byte = 8 bits. Consists of 8 1s or zeros.

Remember that bytes are in powers of two with a base of 8.

Power           Exact Value         Approx Value        Bytes
---------------------------------------------------------------
7                             128
8                             256
10                           1024   1 thousand           1 KB
16                         65,536                       64 KB
20                      1,048,576   1 million            1 MB
30                  1,073,741,824   1 billion            1 GB
32                  4,294,967,296                        4 GB
40              1,099,511,627,776   1 trillion           1 TB