You need a mount point. This is a directory where you want the drive mounted to your file system. You can use an existing empty folder, or create one. It should be empty.
What file system? Fat32 or NTFS? If it is NTFS, you need write support, you need the NTFS-G3 driver loaded.
To make the partition mount at boot time, you need to edit the /etc/fstab file and add a mount command for the partition.