hdparm -tT /dev/hda
gives reading of read speeds for hard drive
hdparm -d /dev/hda reads out wether DMA is enabled ot not
hdparm -d1 /dev/hda enables DMA
hdparm -c dev/hda reads out wether 16bit or 32 bit support is enabled
hdparm -c1 /dev/hda enables 32bit support
more or less same principle can be aplied to /dev/hdc or hdd
add those lines to end of /etc/rc.local to make it auto enable on boot
also you may need to add
options
hd-cd dma=1
to end of /etc/modules.conf
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