假设磁头当前位于第 148 道,
正在向磁道序号减小的方向移动。现有一个磁道访问请求序列为 42,92,154,193,139,63,116,165,160,198,143,158,采用 SSF 调度(最短寻道优先调度)算法得到的磁道访问序列是
154,158,160,165,143,139,116,92,63,42,193,198
143,139,116,92,63,42,154,158,160,165,193,198
143,139,154,158,160,165,193,198,116,92,63,42
154,158,160,165,193,198,143,139,116,92,63,42
答案
143,139,154,158,160,165,193,198,116,92,63,42
解析
SSF 调度(最短寻道优先调度)算法不被当前磁道方向影响
始终选择距离当前最近的磁道