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Actually, it is easy to understand: every drive has used and unused area, all files are stored in used area and controlled by File System of this drive. Some people doubt if the disk drives really can be resized, especially for the system partition, because Operating System running from there. If you have seen the low disk space alert and red C drive, try to increase C drive as fast as possible, otherwise, you have no space to install Windows update, system reboot unexpectedly or even crash. In Windows 7 and later editions, C drive (including all data drives) will be marked as red when opening My Computer or Explorer. In this situation, in Windows XP/Vista and Server 2003/2008, you’ll receive the Low Disk Space warning. After running the computer for a period of time (some people feedback 3 months), the system C drive is running out of free space and becomes full.
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