I am useing WD Hard drives for a while now and i just upgraded pc to a new Windows 7 machine x64 bit i have 4 external drives various sizes and i have 3 that show in explorer and i can use but the fourth will not show in explorer so i can see whats on it. i have check disk management and it show there but i cant do much with it. as far as i can tell it doesnt have a drive letter. as suggestions or answers?

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