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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