If you used the mounted volumes method, it should work even after an eject, unless the GUID has changed.
You can compare the current GUID, by running this on the command line
mountvol D: /L
You will get something like this-
\\?\Volume{f87a65f5-43f1-11e2-90f6-6045bd6af11b}
copy that string and paste it into your mountvol command as follows:
mountvol C:\Data \\?\Volume{f87a65f5-43f1-11e2-90f6-6045bd6af11b}
Assuming that Data is the empty directory you are mounting it to, if not, just change it to whatever you were previously using.
If you used the link method, it will be broken, so use mounted volumes, and then re-index.