I think that you have your terminology a bit mixed up. A hardlink can't cross disks, they can't even cross filesystems on the same disk. I think what you may be referring to is a mount point or a symbolic link. It would have to be one of the two.
Mount points are specified in the /etc/fstab table. Sym links can be viewed by looking at a 'ls -l' and sym links will show what it points to on the far right.
Post which you think it is and if you could provide an example, it would sure help us clarify the problem.
Gary
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