The problem is, depending on the OS version your are running, you probably won't be able to recognize anything larger than 2.2TB. I have an Xserve 2,1 and I can't get anything larger than 2.2 TB yet. I can't even partition 1Tb and 2TB on a 3TB drive. WD and Seagate no go. My understanding it is a hardware limitation. My MacPro has no issues recognizing any size drive.