Originally Posted by colorblindjimbo
Is the drive an external drive? Or slave? If its external check your USB port/cable.
It very well might be a gfx card problem, but I'de try to see if its a problem with the hard-drive.
Try to uninstall the hard-drive, and reboot. It will redect it etc... Do it through device manager.
Could also maybe a sata controller or something.
He said its merely a different partition on his master drive.
Just for giggles, run a virus scan. Preferably one in normal mode, then one in safe mode on the afflicted partition. It would explain perhaps how your drivers mysteriously misbehaved, and the lag during certain operations.
The fact that the other partition on the same drive does not suffer the same problems means that its not a hdd problem; so don't worry about your hdd specs.