Second 2Tb SATA drive not recognised

I am trying to install an auxiliary/slave SATA hard drive on an Ubuntu PC. The new drive is 2 TB. I am able to install 1 TB drives, however when I try the new 2 TB disk, it is not recognized. At first I believed the drive to be at fault and had it replaced. The replacement behaves in the same way, making me think there's a system problem/oversight. In the BIOS, the SATA mode is set to AHCI. The other options are disabled, IDE and RAID mode. The 2tb hdd does not seem to show up in the boot options. Just what I believe is the main drive and the DVD drive. Could it be that the BIOS or Mother board do not accept 2T HDDs? The mother board is an Asus P8Z68-M Pro and the BIOS version is 0402. "sudo fdisk -l" shows only the master drive and not the second disk: Disk /dev/sdb: 931,5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0xdd82f21f Dispositivo Inicializar Start Fim Setores Size Id Tipo /dev/sdb1 * 2048 1928396799 1928394752 919,5G 83 Linux /dev/sdb2 1928398846 1953523711 25124866 12G 5 Estendida /dev/sdb5 1928398848 1953523711 25124864 12G 82 Linux swap / lspci returns: 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05) 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5) 00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (rev b5) 00:1c.5 PCI bridge: Intel Corporation 82801 PCI Bridge (rev b5) 00:1c.6 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 7 (rev b5) 00:1c.7 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 8 (rev b5) 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation Z68 Express Chipset Family LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 05) 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05) 01:00.0 VGA compatible controller: NVIDIA Corporation GF119 [GeForce GT 520] (rev a1) 01:00.1 Audio device: NVIDIA Corporation GF119 HDMI Audio Controller (rev a1) 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06) 04:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge (rev 01) 05:01.0 Multimedia audio controller: Xilinx Corporation RME Hammerfall DSP (rev 11) 06:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller (rev 01) 07:00.0 USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Controller