●A disk scheduling mechanism in an operating system causes the disk arm to sweep
●A disk scheduling mechanism in an operating system causes the disk arm to sweepbackand forth across the disk Surface servicing all requests in its path．This is a (73) ．
(73) A．First Come First Serve
B．Shortest Seek Time First
C．Scan
D．None of the above
正确答案：C【解析】译文：操作系统的磁盘调度机制引起磁盘臂在磁盘表面前后掠动。这叫做扫描。
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