Note that on XP (obsolescent but still around) it is impossible to use a drive larger than 2 TB due to limitations in Windows itself.
On some systems the BIOS cannot deal with a drive larger than 2 TB but this should not be an issue if the external drive is connected after Windows is already running.
See https://support.microsoft.com/en-nz/help/2581408/windows-support-for-hard-disks-that-are-larger-than-2-tb and the method described down the bottom.