I have Intel® Desktop Board D101GGC with 80 GB Hard Disk

1. DMA is not working. So the system is very slow
2. I used hdparm –d 1 /dev/had but it failed to set the DMA
3. You almost had it… hdparm -d1 /dev/hda should work for you. I'm not sure exactly how Red Hat handles startup but you can add that command to something like /etc/init.d/rc.local and have it done automatically when you start up.

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