Third party applications – Most of the 3rd-party applications install to C drive by default, the more programs installed, the less free space remaining.Windows updates – In both Windows PC and Server, Windows Update always be downloaded continuously.There are so many kinds of files write into C drive ever day, for example: However, in most of the Windows computers C drive full is caused by files filling up. Some people feedback that C drive shows as full is because virus or Windows calculate the disk space by mistake. Every time when you open File Explorer, you’ll be alerted. So, Microsoft makes additional change from Windows 7 by replacing default blue bar to red, when the free space of a drive is less than 2GB. In addition, 200MB threshold is too small to some people. Red bar in File Explorer – C drive out of space warning message only preserve 10 to 30 seconds, some people may miss this notification. Low Disk Space alert – If any data partition or C drive is running out of space, when the free space reachs 200MB threshold, there is a balloon Low Disk Space notification on bottom left with warning message that you are running out of disk space on a drive.
It causes many issue if the system C: drive is full, so Microsoft designed two methods to warn Windows computer users before C drive is getting full.
