Defrag partition with no drive letter designation?

How do I defrag an NTFS partition that has no drive letter. I have partitions that are hard-linked to my "C" partition, but they aren't defragged or even seen by Defraggler when I point it at "C". All I can do now is point the app to all the folders on the hard-linked partition one by one :(

You can't name the partitions?

You can't name the partitions?

The volume has a name ... "Data01" ... but no drive letter designation. It does not appear in Defraggler's "Drive" column.