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。
The spreading of sector addresses around the disc gives the operating system time to process each before the next reaches the read-write head.
若把读写头缩入，就可以把磁碟组拿去及贮藏。
When the moving heads of the disc drive are retracted, the disc pack can be removed and stored.
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