The storage density of a disk medium; storing four times the amount of information per disk as single density.

磁盘介质的存储密度，在这种密度下磁盘的信息存储量是单密度盘的四倍。

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The storage density of a disk medium; storing four times the amount of information per disk as single density.

磁盘介质的存储密度，在这种密度下磁盘的信息存储量是单密度盘的四倍。

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