How big is your BIOS saying the drive is? Note you need a motherboard with UEFI BIOS for drives larger than 3Tb (with the latest BIOS update, if available). If your board is standard BIOS, or even with UEFI, you may be better off, and happier with the performance if you boot to a 128-256Gb SSD, then use that monster 4Tb as storage.