1TB WD Hard Drive Performance

[Soundmanred]

The drive is a WD 10EACS-00ZJB0 (Greenpower) .
It reads fine, and I can transfer stuff off of the drive with normal speeds (comparable to my other drives) but writing to the drive is a waste of time (literally). Small files are ok, but anything larger (1GB or so) starts off saying a few minutes on the progress bar, then goes up from there to 120+ minutes and after a while (10-15 minutes) I just cancel the transfer. I have another SATA drive in the PC and it works fine, plus I have connected the WD to a PCI SATA card to rule out the possibility of a bad SATA port.
Here's the confusing part - it works perfectly in my other machine, reading and writing...???
Thoughts?

 

[Quiksilver]

System specs?

 

[yh125d]

Download HDtune. Do an error scan and a benchmark, and post your results. It may not be a healthy drive

Also, PCI itself is limited to 133MB/s but sata goes up to 300MB/s. Try the drive out in the SATA port that the other healthy drive is on

 

[Soundmanred]

That's the thing, the drive is perfectly fine (no bad sectors, no errors) and works as expected in my other PC (a stock Dell Vostro 200).
The PC I'm having trouble with it in is an Abit IP35-E (newest bios), 4GB G-Skill DDR-800, 8600GTS, 500w PS.
I have two IDE drives and one 500GB SATA drive in the system. I've tested it with just the boot drive (80GB IDE) and the 1TB drive, same deal.
I've tried the 150 limiting jumper on the drive, reverting to the last 5 BIOSes, downloading the newest drivers for the add on SATA card and motherboard controllers/chipset, different cables, ports, etc.
I put it back into the Dell last night just to make sure I wans't imagining things, and transferred stuff to and from the drive at great speeds.
Maybe I'll just pick up a new 1.5TB drive and try that out.