Resolve Windows 7 C Drive Red Bar Problem

Low Disk Space warning in Windows 7 will result in HDD red indicator bar, if your system is running slower and slower, that probably means C Drive is full and red.

Situation: My C Drive is showing Red in Windows 7, C Drive gets full without reason, is it low disk space problem on C Drive? Or is it getting C Drive full because of Virus? What's the solution? How to resolve this?
C Drive Red Bar
Winodws 10 C Drive Red Bar

The screenshot is from Windows 10, C Drive is in red bar status, not Windows 7, but you get the point

There are many ways to change low disk space warning in Windows 7, you can delete large files not often used, or programs no necessary, but low disk space issue often happens in C Drive, and it's risky to deleting files in C Drive if you are not familiar which file name is system related, so the best way is to do it in third party software focus on disk partition problems.


Extend Volume function in Disk Management can solve C Drive Red Bar problem by extending its size. However, you have to delete D Drive, or the partition right behind C: to make this function active, or else Extend Volume will gray out even when you have enough free space in other partitions.

Let's Do it step by step:

  1. Backup D partition, for example, you can use Copy Volume function in Partition Expert to backup D partition quickly.
  2. Press Win+R to open RUN box, type diskmgmt.msc in the box, press Enter
  3. Right-click on D Partition,> Delete Volume; > Confirm; Now you can see D partition becomes unallocated space.
  4. Right-click on C Drive, > Extend Volume; Follow Extend Volume Wizard
  5. Now open Windows Explorer, you can see C Drive is now in Normal color again.

Alternative way to resolve C Drive Red Bar problem is to Run Partition Expert, Resize C Drive, Let's start.

1. Download, install, and Run Macrorit Partition Expert.

2. Click C Drive, and Choose Resize/Move Volume from function column, or just right-click.


3. In the popup window, Drag the handle to new size


4. Do the same operation on C Drive, Resize/Move Volume again


5. OK,>, Commit and Done.

If you don't want to extend volume to solve C Drive Red Bar problem, you can do the following during daily work:

  1. Empty recycle bin.
  2. Clean junk files, temporary files, zip files in download folder, installation files you don't use often, file installation package.
  3. If program temporary files are increasing, uninstall and reinstall it.
  4. Reinstall or Repartitioning, if you don't mind time-consuming.