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.
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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