I am using a number of external drives for backups etc and sometimes these fill up quickly. So I need to delete redundant files to make space. I was just looking at one of these trying to work out why it was full again. Using a program called folder size, I could drill down on what was actually eating my space. I was surprised to see a recycle bin taking up almost 10% of the space. Weird thing is that highlighting the drive, right click properties and then doing a disk cleanup supposedly the drive is empty. But when accessing the folder/recycle bin I can see subfolders with content. As this is a system folder, I am a bit wary in just deleting stuff. Any idea why the Disk Cleanup does not work in this case and if I can just right click/delete these subfolders?