|Look at the link below this paragraph. You should first test the drive to see if there is a defect. If the drive tests OK then install the file linked above.|
If the drive stops before the data in the buffer has been written, you may encounter data corruption. I am not sure if that is the issue or not. WD 2TB drives has some issues with WinXP due to cluster sizes. I am not sure if that is applicable in the case of USB external drives or not.
If you look at what OSes the spin down file is directed at you will see it doesn't apply to Vista or Windows 7. I suggest you download that file and install according to the instructions.