This alert appears when the free space of a partition is lower than 200MB. I'm sure that you know what I am talking about, so I will skip any other description of the alert and tell you the steps to follow to disable that.
Here are the steps:
- open Registry Editor (Start/Run, type regedit and press Ok or Enter)
- go to HKEY_CURRENT_USER / Software / Microsoft / windows / CurrentVersion / Policies /
- right click somewhere on Policies folder, New -> DWORD Value
- rename it "NoLowDiskSpaceChecks" (without quotes)
- double click on the "NoLowDiskSpaceChecks" and set Value Data: 1