I have a Windows 7 Ultimate (x64) Service Pack 1 (build 7601.24106) on an ASUSTeK Computer INC. M3A78-CM Rev X.0x MoBo.
I just purchased a Seagate Barracuda 4tb drive to install as backup. The Mobo supports 6 Sata drives and this was my 5th drive.
First, I couldn't even boot it up. So I removed the other drives, except the boot and it allowed me to boot. (I seem to recall a 4 Sata limit from somewhere??)
Then when it booted, I entered Disk Management to format the new drive and it automatically segmented the drive into 2 partitions.
Disk Management allowed me to format and activate the first (primary) partition, but I can't do anything with the remain partition. All of the Tasks are greyed out.

Any suggestions for either issue?