Disks running out of space according to SharePoint 2010

I have a SBS2011 running SharePoint Foundation 2010. The configuration contains 4 disks, C: with system, D: with Exchange data, E: with SQL data, and F: with user data.

Control panel System / Advanced System Settings / Advanced / Performance Options / Advanced / Virtual Memory has "Automatically manage paging filesize for all drives" checked, and in the dimmed window it shows "C: System managed, D: None, E: None, F: None". So to me it seems like there shall not be any paging file on F:

But I'm still getting a warning from SharePoint that "Drives are at risk of running out of free space", and if I click on the warning then I see that it's pointing to F:.

Is seems ridiculous to have 80GB free space on all disks just to eliminate this warning. Is there some way to tell SharePoint where the swapfile / dumpfile shall go so that I can just alllocate this space on one disk ?

MWebjorn