1.7 - Units of Measurement
2016 - Unit 1
All computer systems communicate, process and store data using binary.
Binary is a number system consisting entirely of 0s and 1s.
A single binary value (a 0 or a 1) is called a bit.
4 bits is called a nibble (e.g. 0101 or 1100).
8 bits is called a byte (e.g. 10101001 01011100).
There are two main measurement systems:
Metric Units of Measurement
The metric system is also known as the decimal system.
Metric values (usually) have a prefix ending in ‘a’ such as megabyte or gigabyte.
The gap between units is always 1,000. For example, 1,000 bytes in a kilobyte and 1,000 kilobytes in 1 megabyte.
Binary Units of Measurement
Binary values have a prefix ending in ‘bi’ such as kibibyte or mebibyte.
The gap between units is always 1,024. For example, 1,024 bytes in a kibibyte and 1,024 kibibytes in 1 mebibyte.
Computer scientists use the binary system of measurement because the storage size is technically more accurate.
1.7 - Units of Measurement:
1. a. How many bits in a nibble?
b. Put the following values in order from largest to smallest: MiB, TiB, PiB, KiB, GiB
c. How many gigabytes make a terabyte?
d. How many tebibytes make a pebibyte?