Scan disk will take sometime ; best go do something else for few hours after the scan started . it could taker longer if its larger hard drive 扫描磁盘需要一些时间；在扫描启动后的几个小时里最好做其它事情。更大的硬盘可能花费更长的时间。
2.
Paul nipkow obtains a patent in germany for tv , using a selenium cell and a mechanical scanning disk . first long distance call : boston to nyc 保罗?尼普可夫获得德国电视发明专利。他在电视技术中采用硒光电管和机械扫描盘。第一次长途呼叫：从波士顿到纽约市。
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This avoid high cost by using post - pruning measure which require many times for scanning disk data and amount of cpu time . so we gain a high efficiency 这避免了后剪枝策略所需的高昂代价，减少了扫描磁盘数据的次数和大量的cpu时间，进一步提高了算法的效率。
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