Update index.html
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<div class="algorithm-card">
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<h3>SCAN (电梯算法)</h3>
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<ul>
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<li>按一个方向移动直到最远端的请求,再反向移动</li>
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<li>按一个方向移动直到末端,再反向移动</li>
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<li>避免了饥饿现象</li>
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<li>对于双向磁盘访问较为公平</li>
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<li>性能介于 FCFS 和 SSTF 之间</li>
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