Copying Programs

I am a little confused. I have a program on a floppy disk, which i want to put on a computer. I know it is cp disk/(filename) /(filename) but the second (filename) I'm not quite sure what it is. i have a door lock so it would be cp disk/door /(file name) what am i moving it to, what is the computer's "code name" as the floppy disk's is "disk"?

the computer is the root so / will put the program on the computer from the disk. ( technically the disk is /disk/ )

You would type
cp disk/door /lock
or change lock to whatever you want the file name to be.