4TB storage capacity with SATA 6Gb/s NCQ Interface Double your capacity and drive down costs with up to 1TB-per-disk hard drive technology Seagate AcuTrac servo technology delivers dependable performance, even with hard drive track widths of only 75 nanometers Free Seagate DiskWizard software allows you to install 3TB and 4TB hard drives in Windows, including XP, without UEFI BIOS