hey firon any hope to fix that problem while u are at disk stuff? http://www.pleasuredome.org.uk/index.php http://forum.pleasuredome.org.uk/index.php?showtopic=17928 firon The files themselves all have "good" data, but they're padded with garbage (usually zeros) after where the file should end. In theory, the zip files will work anyway, but clrmamepro will definitely complain about them being wrong. A simple truncation to the correct filesize will fix the files. A force re-check does not fix the problem, since µTorrent does not truncate files, ever (which is probably a bad thing). We're investing to see how we can fix the problem. Unbuffered writes in Windows have a limitation where filesizes must be an exact multiple of the block size, so you need to open it in buffered mode to create it, then drop back. Unfortunately, this sporadically fails, so it ends up having to create the file in buffered mode.