How to repair mount point when I can't login
Here is my problem:
I had two hard drives, "Mac SSD" (primary) and "Mac Data"(secondary). Unfortunately, all of my users home directories were on "Mac Data".
I tried to install an app which complained about the space in the path to my user directory, so I used Finder to rename my drive "MacData" - which Finder was happy to do for me.
Of course (I now realise why), after rebooting, I find that I'm unable to login to any of my user accounts because the paths for those accounts all point to "Mac Data", not "MacData".
So, to fix my problem, I seems that I have to either,
1. Change the path for my user accounts to point to "MacData", or
2. Change the mount point for the drive back to "Mac Data".
I can't work out how to accomplish either of these without being able to log in as a user.
Can I do either of these things via the Recovery function (Cmd-R), or the Single User Mode (Cmd-S)?
Thanks in advance for any help you can offer.
MacBook Pro, OS X Mountain Lion (10.8.4)