AMD Phenom II X6
Mobo: ASUS M5A97 LE R2.0
DD3 8 Gigs
I just received a WD Caviar Black 1 TB HDD and it runs slow. It switches to Pio4 whenever I try to use it. I have ran HD Tune and it reported CRC errors. I have ran disk check, no problems. I have updated BIOS, chipset. I have switched cables and ports several times.
I have uninstalled the controllers hoping to reset it to Ultra DMA 6. When I run the computer in safe mode it lasts longer in DMA mode until I try to do several things with it then it eventually goes to pio4 mode. I did notice under the IDE ATA controllers in device manager there is: ATA Channel 0, ATA Channel 3, Standard AHCI 1.0 Serial ATA Controller. When I check under the channels the device description it lists IDE Channel. I'm not sure if this is what it should be.
I have no idea what else I can do. The HDD seems to work but I'm not sure. I checked all the BIOS settings and they seem to be right.
The OPT1 jumper forces the HDD to autonegotiate a lower SATA link rate. It appears that there are much less communications errors at the lower speed.
As for how to "fix" the problem, if HD Tune's benchmark graph is displaying the full curve, then you don't really need to fix anything. Otherwise, if the curve has a long flat plateau at the outer zones, then that might require investigating.
"Link speed" is the speed of transmission over the SATA data cable.
Let's say you have a SATA controller on your motherboard that is only designed for 3Gbps link speeds. If you plug a 6Gbps drive into the SATA port, then it will need to negotiate a mutually acceptable link speed with the SATA controller.
Alternatively, it could be that a 6Gbps controller and a 6Gbps HDD cannot communicate at 6Gbps without errors, so they would normally shift to a lower speed, eg 3Gbps. In fact some SMART reports have a "SATA Downshift" attribute. In your case it could be that the two parties are persisting with an error prone link speed that neither can properly handle, so you need to intervene by forcing them to negotiate a lower speed. As long as the link speed is greater than the drive's maximum sustained data transfer rate, then you should see no performance hit.