Can you make a screenshot after pressing F6 to show how you have set it up? Is the Find & Replace checked or unchecked? If you just want to change the path I would let that unchecked.
Normally if you just replace the path /Volumes/HD1/... with /Volumes/HD2/... that should just point to HD2 and you should see everything at HD2.
Paths, I believe in any OS (Windows, Mac, Linux cannot contain ?. / is interpreted as a folder level. I believe " should be OK.
File names can contain ? and " but also not / because that as well, would create another folder level.
If the R,M&C cannot find files with " or ? that may point to encoding differences. I have had to replace special characters in file names with "manually" generated ones, even though they "looked" exactly the same.