usb drive not found in network

[the_bertrum]

As I remember, file sharing was on by default in the v7 series. Why you can't see the shares in that case would be for some other reason. In order to get support though, it's best to run the latest version because the folk who can help won't necessarily have the older version to be able to replicate you issue. So upgrade to the latest version, then you'll see the options @Nutul referred to which you can turn on, then if you still can't see your drive we can begin trouble shooting.