本文详细介绍了如何通过在Ubuntu系统中使用`dd`命令清空未使用的磁盘空间，并在虚拟机关闭后进行磁盘压缩，以提高实际磁盘使用效率。
In vmware virtual machine such as ubuntu, there is a 40G disk, which has 20G data and 20G empty space,
so, vmware will use 20G real disk space.
If you delete 10G data, vmware will also use 20G real disk space.
How to improve real disk space?
Firstly, in ubuntu system, you should write 0 to all space.
dd if=/dev/zero of=/root/file bs=8M
Then, poweroff the ubuntu, and compact the vmware disk as follows.
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