Operating System (OS)
Part of the POST process is to ensure that the test of essential peripheral device coincides with the hardware configuration that stored in

Cache Memory
The hard drive
ROM
CMOS

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Operating System (OS)
The function(s) of file system is (are):

to provide security against loss of information due to system failure
All of these
to provide complete file naming freedom to the users and to permit controlled sharing of files
None of these
to provide for long and short term storage of files with appropriate economic tradeoffs.

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