OpenSUSE Hardware :: DMA Disabled On All Hard Drives?

Recently I noted that when transferring files between my HDs the CPU usage increases up to 80~ 100%. After the transfer ends, the cpu goes back to normal. The system monitor reports no process consuming those cycles, yet there is something eating up The CPU.

Doing some research I concluded it was probably something related to DMA and UDMA. which is weird because all my drives report they have UDMA6 enabled in the BIOS, and in windows I don't have that problem.

Running hdparm -d gives me the following error: /dev/sda3: HDIO_GET_DMA failed: Inappropriate ioctl for device for every partition on every device, though this does not actually tell if DMA is on or off I suspect it is off. I checked if this was a suse exclusive problem, and to my surprise, debian and aptosid, behave exactly the same. The only reason I didnt note before is cause I had never transfered so many files before, (about 250GB) and the small transfers I did were over quite quick.

I'd like to make emphasis on:

1.The problem is the same regardless if I transfer 5GB or 150.
2. In windows my cpu does not go above 10% at any time during the transfer.

I have 3 sata HDs. All my OS's are in sda (120GB) I use sdb (250GB) and sdc (500GB) as data and media storage. ALl drives are Western Digital with less than 2 years of usage, and pass all smart tests with flying colors.

CPu AMD x2 5400 @ 2.8GHz
4GB DDR2 800MHZ
Mother board A780G M2+ SE