Trying to shrink my SSD but having issues?

[cHk4]

Using windows 7, I have over 30 gig of free space on my SSD yet when I go to try and shrink it using the in build windows way I get the below - 192mb free?

Any idea? I'm trying to put another OS in the partition and need about 11 gig of space.

Thanks

 

[Akempster]

as far as i know there is no way to decrease the size of the files further than this, alhtough i would look to see if there are any OS files that are not needed any more like dump files etc.

 

[frying_pan_cat]

It may be something to do with unmovable files as it does say there "You cannot shrink a volume beyond the point where any unmovable files are located". That's just a guess though