Operating System (OS)
A disk scheduling algorithm in an operating system causes the disk arm to move back and forth across the disk surface in order to service all requests in its path. This is a

Scan
First come first served
FIFO
None of these
Shortest Seek Time First (SSTE)

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Operating System (OS)
Backups should be done

as several image copies, followed by an incremental
None of these
as several incrementals, followed by an image copy
weekly for most installations
daily for most installations

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