All the sectors on a disk platter that can be read without moving the head constitute a track.

磁盘盘片在无需移动磁头的前提下即可读取的所有扇区组成一个磁道。

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With sequential access, the disk head can move directly to the next available track on the disk.

使用顺序访问，磁盘头可以直接移动到磁盘的下一个可用磁道。

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As mentioned above, random access requires the disk head to move randomly over the disk to find the proper data points.

正如上文提到的，随机访问要求磁盘头能随机移动到磁盘上，查找对应的数据点。

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However, the new drive will be significantly slower when writing to the older 100MB disks -- because of the head design changes needed to increase per-disk capacity.

CNN: Iomega announces 250MB Zip drive

Getting to that stage might mean combining self-assembly methods with lithography, or doing away with the head that reads the data-packed disk and instead creating a self-assembling solid-state system on the model of Flash memory storage used today.

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