其实Windows Vista就内置了这样的一个功能，称为“磁盘定额分配”，那么如何开启呢？
*打开资源管理器
*右键需要进行此操作的磁盘 - 属性
*勾选“开启磁盘定额分配”和“超过限制后禁用”
*在“将磁盘限额设置为”选项中填写适当的数字
*确定
附部分原文：
We can easily running out of disk space if we keep on saving files without performing disk clean up from time to time or move them to external storage device. In order to avoid such incident from happening, proper control of disk usage is important and Windows Vista has a feature that allows you to set quota of disk space usage besides triggering you when the warning limit is being hit.
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