File Manager Software recommendation

[expat]

xcopy /D /E /V /H /R /Y <source directory> <destination directory>

/D is newer files
/E is search subdirectories
/V is verify each copy
/H is copy hidden and system files too
/R is overwrite read only files
/Y is don't bother prompting to overwrite.

Although it's command line it's the best tool and part of windows.

You might need xxcopy or similar (search google) if you have very long file names with subdirectories etc.

That is what I did before I found Allway Sync.

The unix equivalent is what I went back to on the Mac, for want of Allway Sync. Cannot recomend it highly enough.

[expat]

Also, the command line copy doesn't do everything. If you sometimes make changes on one disk or directory, and sometimes on the other, you need to run it in both directions. And if you delete a file, this command will just restore it from the other disk/directory. A good program, like Allway Sync, will propagate the deletion to the other location (if you allow that option).