@mikeh1982 Transferring the ROMs via USB is done automatically so there is no need to look at the directories, you don't need to manually move anything. If you use samba share over the network then the 4 directories are automatically shared to allow you to edit, transfer, delete, manage etc... Just as a tip, you can add extra folders / directories to be shared over the network. If you go to /etc/samba and open smb.conf you can add entries, eg
[home] comment = home path = "/home/pi" writeable = yes guest ok = yes create mask = 0644 directory mask = 0755 force user = piOr add any other path you want to access...