Didn't work for me, I edited the hdparm.conf to read

/dev/hda {
mult_sect_io = 16
write_cache = off
dma = on
io32_support = 3
}

rebooted and checked the dma status and it is still off, I know how to use hdparm to turn it on after knoppix is loaded but would like it to boot this way.

I also don't see anything in bootmisc.sh to turn dma on?