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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 Measured in:

 CPU word size        bits

 Disk/SSD/USB drive   bytes
 Memory (RAM)         bytes

 ****************************************  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 Measured in:

 Parallel bus/channel      bytes/sec
 Parallel disk drive       bytes/sec
 Memory (RAM)              bytes/sec

 Cellular data plan        bytes

 Serial bus/channel        bits/sec
 Serial disk drive         bits/sec
 Network & communications  bits/sec

 Disk access time          ms
 RAM 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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