Problem: On Debian Linux the brand new 3TB SATA Drives only seen as 2TB Drives by fdisk Background: GPT Partition Table must be used as new technology Solution: install „gdisk“ the GPT Tool for big Drives with #sudo aptitude install gdisk clean the new Drives first Table Headers with #sudo dd if=/dev/zero of=/dev/sdb count=1 bs=512 run now #sudo sgdisk /dev/sdb Command is „sgdisk“ not „gdisk“ = its Paket Name same on other Linux/BSD Systems on Windows use Paragon Tools