Click a topic to learn more.
********************************* *********** S P A C E *********** ********************************* Bits or Bytes Power of 10: Kilo (K) Thousand 3 Mega (M) Million 6 Giga (G) Billion 9 Tera (T) Trillion 12 Bytes Peta (P) Quadrillion 15 Exa (E) Quintillion 18 Zetta (Z) Sextillion 21 Yotta (Y) Septillion 24 Bronto Octillion 27 Geop Nonillion 30 Storage Capacity Measured in: CPU word size bits Disk/SSD/USB drive bytes Memory (RAM) bytes ********************************** ************ T I M E *********** ********************************** Fractions of One Second Power of 10: Millisecond (ms) Thousandth -3 Microsecond (µs) Millionth -6 Nanosecond (ns) Billionth -9 Picosecond (ps) Trillionth -12 Femtosecond (fs) Quadrillionth -15 Attosecond (as) Quintillionth -18 Zeptosecond (zs) Sextillionth -21 Yoctosecond (ys) Septillionth -24 Transmit/Transfer Measured in: Cellular data total bytes Parallel bus/channel bytes/sec Disk/solid state drive bytes/sec Memory (RAM) bytes/sec PCI Express bus bytes/sec USB bits/sec Network/communications bits/sec Disk access time ms SSD access time µs RAM access time ns Machine cycle µs, ns Instruction execution µs, ns Transistor switching ns, ps, fs CPU Speed - Clock Cycles Per Second 1 cycle/sec = 1 Hertz See Hertz. kilohertz (kHz) thousand megahertz (MHz) million gigahertz (GHz) billion