I haven't tried this with 3.8.1. yet. With older versions of Knoppix I had no problem writing to the FAT partition. Knoppix does default it to read-only, you have to make sure that you mount it as read/write, either from a shell with the mount command or by right clicking on the partition icon and selecting actions ... from the menu that pops up. I'm wondering if you'vecome across a problem with the new file system, but it does seem unlikely.