So using hdparm, I looked at both my hard drives, the both offer various PIO, DMA and UDMA modes. I get operations not permitted errors if I try to turn on DMA using hdparm -d1 /dev/(whatever harddrive)
Any idea why I cant turn on DMA? and why I still have slow parity builds in the 3000 min area for a 250GB parity and 200Gb data