why is not dma on by default in hoary with the new 16x dvd writer ? sudo hdparm /dev/hda /dev/hda: IO_support = 1 (32-bit) unmaskirq = 1 (on) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) HDIO_GETGEO failed: Invalid argument