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Sector mapping: a method of speeding up disc access time.
区分替换：加快磁碟存取资料的方法。
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The spreading of sector addresses around the disc gives the operating system time to process each before the next reaches the read-write head.
把区份地址分散于磁碟上，操作系数便有足够时间，在读写头到达另一区份前，逐个地址处理。
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