You could try running CheckDisk with the "fix errors" option checked
(chkdsk.exe /f). Afterward you may have to remove/uninstall the hard disk
controller your drive is attached to from the Device Manager and reboot.
When Windows reinstalls the controller you should have the option to set DMA
again. I haven't needed to do this since I've been running Vista, but this
was how I fixed the problem on XP. By the way, I think you meant PIO. Hope
this helps.
