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The following units of measure are used to define digital capacities and speeds. For measurements of a meter, see metric system. See binary values, NIST binary and long scale.
************************************** S P A C E **************************************                      10 to theBits or Bytes         Power of:

 Kilo  (K)  Thousand       3
 Mega  (M)  Million        6
 Giga  (G)  Billion        9
 Tera  (T)  Trillion      12


 Peta  (P)  Quadrillion   15
 Exa   (E)  Quintillion   18
 Zetta (Z)  Sextillion    21
 Yotta (Y)  Septillion    24
 Bronto     Octillion     27
 Geop       Nonillion     30

 Storage Capacity Is Measured in:

 CPU word size        bits
 Disk/tape/USB drive  bytes
 Memory (RAM)         bytes
 Memory chip          bits

 ****************************************  T I M E  ***************************************Fractions of a second    10 to theSecond                  Power of:

 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 Speed Measured in:

 Parallel bus/channel      bytes/sec
 Parallel disk drive       bytes/sec
 Serial bus/channel        bits/sec
 Serial disk drive         bits/sec
 Network & communications  bits/sec
 Disk access time          ms
 Memory access time        ns
 Machine cycle             µs, ns
 Instruction execution     µs, ns
 Transistor switching      ns, ps, fs

 CPU Speed - Clock Cycles Per Second
 See  Hertz.

 kilohertz (kHz) thousand
 megahertz (MHz) million
 gigahertz (GHz) billion
 terahertz (THz) trillion
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