- Metric prefixes
Multiplication Prefix Symbol Factor 10 ^{24}yotta *Y*10 ^{21}zetta *Z*10 ^{18}exa *E*10 ^{15}peta *P*10 ^{12}tera *T*10 ^{9}giga *G*10 ^{6}mega *M*10 ^{3}kilo *k*10 ^{2}hecto *h*10 deca,deka *da*,*dk*10 ^{-1}deci *d*10 ^{-2}centi *c*10 ^{-3}milli *m*10 ^{-6}micro 10 ^{-9}nano *n*10 ^{-12}pico *p*10 ^{-15}femto *f*10 ^{-18}atto *a*10 ^{-21}zepto *z*10 ^{-24}yocto *y* - Bits and Bytes
- Memory size is measured in bits or bytes
- 8 bits = 1 byte
- Usually abbreviated as `b' for bits and `B' for bytes
- CAUTION: memory size is always a power of 2 (2
^{n}) 1kB = 2^{10}= 1024 bytes, 1Mb = 2^{20}= 1,048,576 bits, 2GB = = 2,147,483,648 bytes

- Data Speed
- Transmission speed is measured in bits per second (bits/s, b/s, bps) or bytes per second (bytes/s, B/s)
- CAUTION: 1kb/s = 1000 bits/s, 1MB/s = 1,000,000 bytes/s