Have you tried Clicking to enable?
I won't go into explaining what DMA is but essientially you need to enable it to make sure your harddrives will perform as they should. There is nothing wrong with the drives its just a software setting that needs correcting. I believe WHM can do this automatically (hence the click thing). If whm cannot do it for you you need to login via ssh and do it manually with hdparm. If both methods fail you have a problem with the kernel and it will need to be recompiled with support for your IDE controller.
The hdparm command would be:
hdparm -d1 /dev/hda