with my old setup, whenever i tried to burn files i got off of utorrent, it would hit the buffer underrun protection constantly, because of the fragmentation torrents create.
I solved the problem by having my working directory and finished file directory on seperate hard drives, so once the file is complete, it automatically copies the finished file onto the second hard drive, and in doing so elimates fragments.
I also have my operating system and programs on a THIRD hard drive, so i never have hard drive slow down problems anymore, regardless of what torrents are doing on the other two drives.
If you only have one drive, a seperate partition for your operating system and temp space and one for storage would be my suggestion.