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there, the microprocessor retrieves it from the much-faster cache memory.
Drive caching and RAM caching significantly improve the overall speed of
the computer. See also L1 Cache and L2 Cache .
CD
Compact disc . An optical form of storage media, typically used for audio and
application programs.
CD-R
CD recordable . A recordable version of a CD . Data can be recorded only once
onto a CD-R. Once recorded, the data cannot be erased or written over.
CD-RW
CD rewritable . A rewritable version of a CD . Data can be written to a CD-
RW, then erased and written over (rewritten).
Chip
See IC .
CIM
Common Information Model
. CIM allows remote management application
programs to access system management information on a client computer
running any Microsoft Windows
®
OS that includes the WBEM core
components.
Clock Speed
The speed, given in MHz , that indicates how fast computer components
operate that are connected to the system bus . The speed is generated by a
quartz crystal on the system board that acts as a kind of metronome.
Components that are synchronized with the clock speed can run faster or
slower, but their speed is determined by multiplying or dividing a factor by
the clock speed.
cm
Centimeter(s) . A measurement of length equal to 0.39 inch.
CMOS
Complementary metal-oxide semiconductor . Memory chips that are often used
for NVRAM storage.
COA
Certificate of Authenticity . The Microsoft Windows COA is a 25-digit alpha-
numeric code located on a sticker on your computer. You need the COA to