Windows displays “Low Disk Space” notifications whenever any partition on your computer has less than 200 MB of space remaining. Here’s how to get rid of the notifications, even if you can’t free up the space.
If this warning is about your system drive, you should pay attention to it and free up some space. Windows doesn’t function well if your system drive is completely full. You need some free space, although no one can say exactly how much. Many applications won’t run properly and will crash if you have a completely full drive. At any rate, if you’re seeing the warning, you have almost no space left and should probably free some up.