Operating System (OS)
The total time to prepare a disk drive mechanism for a block of data to be read from it is

latency plus seek time plus transmission time
latency
None of these
latency plus transmission time
latency plus seek time

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Operating System (OS)
System maintenance:

is usually not necessary
is necessary on all systems, regardless of how good
always requires several programs
is not required if the system is well written
None of these

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