diskio.no_zero still doesn't work since 2.0.4! On file write it tries to write zeros to each byte! Imagine downloading a 20 GB file, you start downloading till you cache fills, then it utorrent starts writing the whole file with zeros, overloading HDD and freezing download. I could take a good few munutes, depending on an HDD you are using. It was reported multiple times about this issue. http://forum.utorrent.com/viewtopic.php?id=89780 http://forum.utorrent.com/viewtopic.php?id=91348 Please fix it. I'm downgrading again to the 2.0.4, where diskio.no_zero flag works exactly as it should.