镜像尺寸较小感谢“单一实例”，在一个文件中出现的多个地点的硬盘您成像是唯一一次在储存的磁盘映像。

Image sizes are smaller thanks to "single instancing," where a file appearing in multiple locations within the hard disk you're imaging is only stored once in the disk image.

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储存半瞬态数据和提供交换空间的磁盘。

A disk for storing semi-transient data and swap capability.

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尤其是，如果要将一批新数据添加到单一文件，XFS可以在磁盘上分配一个单一、相邻区域来储存这些数据。

In particular, if a bunch of new data is being appended to a single file, XFS can allocate a single, contiguous region on disk to store this data.

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