Is there a 2TB hard drive that will work with a DDR2 PC

If anything you need a BIOS update (if available), the RAM type will make no differance to the size of HD the system can detect, also you can't use DDR3 in a DDR2 MoBo unless the MoBo supports DDR3.

What's the motherboard make and model, please?


> I took system and drive to a 'pro', and he could not get system to 'see' more than 1 TB.

He should have tried it on a different system, before giving up;
that would have isolated a problem with your BIOS, as
MrLinux wisely suggests above.


p.s. I usually hire Pros without the 'quotation' marks  


MRFS

Did WD actually tell you this, or is this what the "pro" said WD said? I find this extraordinary.

You did not mention the motherboard/BIOS DDR2 and DDR3 are not the problem. How you set up the drive in the BIOS is the problem. You also need to load the correct Microsoft Driver. If your operating system came with the machine? Don't use their recovery disk (whatever recovery) they had. You need to partition the drive new. Microsoft puts drivers asleep if they are not used (turned off) Set the BIOS for AHCI not IDE or not RAID if you don't have an independent selection for this option; you won't get the drive installed for the full 2TB. Contact the motherboard manufacturer see if their is BIOS upgrade. If there is install it then install your new drive. BOOT and start installing your operating system (clean install) don't use any disk or disks the OEM designed. Clean install.