Is it possible to convert FAT to ntfs on empty disk with Linux commands or windows is the only option?
Yes, it is possible to convert FAT to nfts. As a graphical solution, you can install gparted, a partitioner on ubuntu. You just have to choose your empty disk and do a right-click on the empty space. Then choose Format to and click on NFTS. If you are finish, click on Apply changes.
I think you can also use
fdisk program in the linux terminal. Type
sudo fdisk-l to see the name of your device (empty disk). Then you have to type
mkfs.ntfs /dev/sdb. Change
sdb with the device name of your empty disk.