If Windows does not report the external drive to be a removable drive then Second Copy would not show the "Copy only to Volume named" field. As a workaround, please set the "AlwaysShowVolumeName" in the profiles.dat file.
Second Copy includes a few options that are hidden from the user interface. To set these options you need to edit the profiles.dat file. Changing these options is not recommended unless you understand the implications of these changes and are familiar with editing configuration files.
To edit the profiles.dat file:
1. Exit Second Copy by right clicking on the icon and selecting Exit.
2. Open the profiles.dat file in Notepad.
3. Find the [Options] section and add the option described below. If you don't see an [Options] section you can create it at the end of the file.
4. Save the file.
5. Start Second Copy again from the start menu.
Set this option to display volume names for all drives including the local, removable, and external disks. When you set this option, Second Copy will display the name of the volume in the profile wizard for the source and the destination drives, if the volume names exist.
profiles.dat file is a hidden file under the folder:
Windows 9x: "\Program Files\SecCopy" (or where Second Copy is installed) Windows NT4/2000/XP/2003:"\Documents and Settings\<Username>\Local Settings\Application Data\Centered Systems\Second Copy"
Windows Vista: "\Users\<Username>\AppData\Local\Centered Systems\Second Copy"