Irwin's hard drive died, so he replaced it with a 3TB drive. But his computer can't see all of it. He's running Windows 10. Leo says it may be a hardware limitation of his computer that's preventing it from seeing all the hard drive. Leo advises waiting until Tuesday with the Windows 10 Creator's Update. It could fix the problem. He'll also want to be using UEFI to boot to it. If not, there are third party partition managers that can fix it.