I have installed a Seagate Backup Plus 8Tb (nominal) USB disk for data backup and
transfer to the UK

As superuser

mount -t ntfs-3g /dev/sda2 /ntfs

[root@aidas1 npg]# df -h /ntfs
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda2       7.3T  167G  7.2T   3% /ntfs

The device name will probably wander at each boot but can be obtained by using

Applications -> System Utilities -> Disk Utility

and selecting device from the menu of Storage Devices.