開啟Windows Vista中的磁盤定額功能的步驟

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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