与磁盘比较，磁带更便宜，并且能保存更多数据，但是随机访问非常慢。
Compared to a disk, a tape is less expensive and holds more data, but random access is much slower.
传输和安装虚拟磁盘文件比较复杂，可能需要经过尝试和纠正错误的过程。
Transporting and installing the virtual disk files was more complicated and involved a small amount of trial and error.
这个问题的答案有点意外，特别是在和基于磁盘的文件系统比较的时候。
The answer to that question is a bit unexpected, especially when compared to disk-based filesystems.
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