As mentioned above, the problem is caused by the disk style - MBR. Under MBR, you can only use disk space at most 2TB. To use disk space larger than 2TB, you need to use GPT disk. Therefore, you need to convert MBR to GPT disk.
Solution (available for empty HDD): Open Windows 7 Disk Management -> Right click the 4TB Disk -> select "Convert to GPT".