I won't be able to see your images until they are approved, but your latest information was enlightening.
After examining your PCI card's drivers and photo, it appears that it uses VIA's VT6421 SATA I controller chip:
Originally I was puzzled as to why two "IDE" drives were being seen differently by DLG. It now appears that your 250GB PATA drive is being accessed via Windows' native IDE driver, while your SATA drive is utilising VIA's IDE driver. DLG and HD Tune are both having difficulties retrieving the 2TB drive's SMART data by way of VIA's driver. I have also seen this issue with utilities such as smartctl (smartmontools), so I don't believe it reflects any problem with the HDD. That is, I would dismiss this issue as a red herring.
As for the UDMA CRC Error Count, I can't explain why these errors are occurring, but the VT6421 chip has certain known problems:
The first "problem" is that the VT6421 chip is limited to 1.5Gbps SATA interface speeds, so it may fail to negotiate a connection to a 3Gbps or 6Gbps drive unless the drive's speed is limited to 1.5Gbps. WD's drives have an OPT1 jumper for this purpose. I expect that yours would already be installed.
The second issue is that "certain WD SATA II 3 Gbps disks on VT6420 and VT6421 will trigger error conditions under which the SATA controller FIFO overflows during controller-disk communication because these disks do not fully conform to the SATA specification."
I'm wondering whether the above problem is responsible for the CRC errors. In any case, I would think that these errors would prompt the drive to retransmit the errored data, so I doubt that there would be any risk of data corruption.
As for your warnings in Disk Management, I can't offer an opinion without seeing them, and even then I'm not sure I could help you.