Hello! Judging from how many search hits I get from googling this question, it's a fairly common problem. I'm trying to install a 4TB HDD into a new PC. I was aware that you can't normally install Windows on a partition of more than 2TB, which is why I installed a 120GB HDD just for Windows, intending to use the 4TB drive for storage. However even when using the 120GB drive for Windows, I could only create a 2TB partition on the big drive during Windows install, and it wouldn't let me partition the rest of the unused space. I'm a little confused because everything I've read gives me the impression that you can make the partitions as big as you want so long as the partition you're booting from isn't more than 2TB. I tried the trick where you use the command console during Windows install to format the 4TB drive using GPT, but it still wouldn't let me create a partition bigger than 2TB. What do I need to do to make the whole 4TB usable? I'm using an MSI 970A-G43 motherboard and Windows 7 Home Premium 64-bit if that helps. Thanks!