The red bar indicates low space warning. You cannot change how it is computed in the settings but you can get rid/hide those warning bars.
Follow the below steps:
- Run REGEDIT as administrator
- Open HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Drive
- Change the values for both TileInfo and PreviewDetails keys (double click on the keys) by removing the phrase "System.PercentFull;", without the quotes.
The TileInfo key:
Before:
prop:*System.PercentFull;System.Computer.DecoratedFreeSpace;System.Volume.FileSystem
After:
prop:*System.Computer.DecoratedFreeSpace;System.Volume.FileSystem
The PreviewDetailskey:
Before:
prop:*System.PercentFull;System.FreeSpace;System.Capacity;System.Volume.FileSystem;*System.Volume.BitLockerProtection
After:
prop:*System.FreeSpace;System.Capacity;System.Volume.FileSystem;*System.Volume.BitLockerProtection
- Open My Computer, you should be able to see the absence of the color bars. If you still see them, just reboot your machine.